# data[].attributes.headline
it is because the cold air is denser than hot air which make it(hot air) float upwards which make it sink and take its place

# data[].attributes.subject
it is because the cold air is denser than hot air which make it(hot air) float upwards which make it sink and take its place

# data[].attributes.headline
It's because there's no air in space, heat transfers in space only by radiation.

# data[].attributes.subject
It's because there's no air in space, heat transfers in space only by radiation.

# data[].attributes.headline
Heat conduction and convection do not occur in space since there is no air in space. Heat transfers in space, which is a vacuum, only by radiation.

# data[].attributes.subject
Heat conduction and convection do not occur in space since there is no air in space. Heat transfers in space, which is a vacuum, only by radiation.

# data[].attributes.headline
As air warms near the surface of the Earth, or on the first floor of a home, the air molecules move around faster, creating more space between those molecules making the air less dense than the cooler air above it. The warm, less dense air rises while the cooler, more dense air sinks down.

# data[].attributes.subject
As air warms near the surface of the Earth, or on the first floor of a home, the air molecules move around faster, creating more space between those molecules making the air less dense than the cooler air above it. The warm, less dense air rises while the cooler, more dense air sinks down.

# data[].attributes.headline
It is because the space is vacuum, no particles. Heat can only transferred by conduction and convection when there is particles, so heat can not be transferred by conduction and convection in space.

# data[].attributes.subject
It is because the space is vacuum, no particles. Heat can only transferred by conduction and convection when there is particles, so heat can not be transferred by conduction and convection in space.

# data[].attributes.headline
It is because the space is a vacuum place, where no  air is in it. In order for convection and conduction to occur, there must be a medium to transfer energy between objects.

# data[].attributes.subject
It is because the space is a vacuum place, where no  air is in it. In order for convection and conduction to occur, there must be a medium to transfer energy between objects.

# data[].attributes.headline
Particles in solid is packed more close than liquid

# data[].attributes.subject
Particles in solid is packed more close than liquid

# data[].attributes.body
Hot air denser than cold air

# data[].attributes.headline
Cold air is denser and heavier than warm air so it sinks

# data[].attributes.subject
Cold air is denser and heavier than warm air so it sinks

# data[].attributes.headline
It is because cold air is less denser and less heavier than hot air, as hot air vibrates more and takes up more space

# data[].attributes.subject
It is because cold air is less denser and less heavier than hot air, as hot air vibrates more and takes up more space

# data[].attributes.headline
Convection and conduction requires particles, but space is a *vaccum*, aka no particles, so convection and conduction don’t work in space.

# data[].attributes.subject
Convection and conduction requires particles, but space is a *vaccum*, aka no particles, so convection and conduction don’t work in space.

# data[].attributes.headline
It is because hot air is less dense that cold air

# data[].attributes.subject
It is because hot air is less dense that cold air

# data[].attributes.body
To allow energy to transfer through conduction or convection, there must be a medium, space is a vacuum which has no medium so no energy cannot be transferred through conduction and convection in space.

# data[].attributes.headline
because cold air is more dense than warm air

# data[].attributes.subject
because cold air is more dense than warm air

# data[].attributes.headline
Because the density of cold air is denser than hot air so it sinks

# data[].attributes.subject
Because the density of cold air is denser than hot air so it sinks

# data[].attributes.headline
Because colder air is more dense than hot air

# data[].attributes.subject
Because colder air is more dense than hot air

# data[].attributes.headline
It is because particles in solid are held more closely together with a stronger bond

# data[].attributes.subject
It is because particles in solid are held more closely together with a stronger bond

# data[].attributes.headline
The particles in a solid are most tightly bond and force between adjacent particles is strong, making heat transfer by collision more efficient. However, liquid particles are loosely packed and are farther apart than in a solid so vibrations don't result in as many collisions with neighboring particles, so its hard for heat to transfer in liquids

# data[].attributes.subject
The particles in a solid are most tightly bond and force between adjacent particles is strong, making heat transfer by collision more efficient. However, liquid particles are loosely packed and are farther apart than in a solid so vibrations don't result in as many collisions with neighboring particles, so its hard for heat to transfer in liquids

# data[].attributes.headline
Because conduction and convection can only take place when there is a medium, but space is a vacuum.

# data[].attributes.subject
Because conduction and convection can only take place when there is a medium, but space is a vacuum.

# data[].attributes.body
It is because colder air is denser and heavier

# data[].attributes.headline
This is because space is a vacuum. For conduction or convection to take place, there must be a medium.

# data[].attributes.subject
This is because space is a vacuum. For conduction or convection to take place, there must be a medium.

# data[].attributes.headline
Because there is less energy in colder air, hence the particles in colder air vibrate less, so they take up less space, making its volume lower thus a higher density, which is why colder air sinks.

# data[].attributes.subject
Because there is less energy in colder air, hence the particles in colder air vibrate less, so they take up less space, making its volume lower thus a higher density, which is why colder air sinks.

# data[].attributes.headline
It is because the particles in solids are closer to each other comparing to liquids.

# data[].attributes.subject
It is because the particles in solids are closer to each other comparing to liquids.

# data[].attributes.headline
Because the particles in solids have a stronger bond than that of liquids

# data[].attributes.subject
Because the particles in solids have a stronger bond than that of liquids

# data[].attributes.headline
This is because hot air is less dense than cold air, enabling it to float upwards through the remaining fluid, allowing cold air to sink and take its place

# data[].attributes.subject
This is because hot air is less dense than cold air, enabling it to float upwards through the remaining fluid, allowing cold air to sink and take its place

# data[].attributes.headline
Because particles in solids are more closely packed than those in liquids.

# data[].attributes.subject
Because particles in solids are more closely packed than those in liquids.

# data[].attributes.body
It is because particles in solids are closer to each other than liquids.

# data[].attributes.headline
The particles in solids are closer than the particles in liquids, allowing them to transfer thermal energy more efficiently than particles in liquids

# data[].attributes.subject
The particles in solids are closer than the particles in liquids, allowing them to transfer thermal energy more efficiently than particles in liquids

# data[].attributes.headline
It is because particles in solid are very close together, particles vibrate more when heated. Allowing energy to transfer through solid easily. 

# data[].attributes.subject
It is because particles in solid are very close together, particles vibrate more when heated. Allowing energy to transfer through solid easily. 

# data[].attributes.headline
Rainbow is formed when the sunlight hits the water drops and the light in it is reflected, showing the colours in the spectrum.

# data[].attributes.subject
Rainbow is formed when the sunlight hits the water drops and the light in it is reflected, showing the colours in the spectrum.

# data[].attributes.headline
Rod cells detect faint light while cone cells detect the three primary colours, red, green and blue. There are three different types of cone cells specialised to detect the primary colours.

# data[].attributes.subject
Rod cells detect faint light while cone cells detect the three primary colours, red, green and blue. There are three different types of cone cells specialised to detect the primary colours.

# data[].attributes.headline
Rainbow is formed when sunlight (white light) is refracted by water droplets

# data[].attributes.subject
Rainbow is formed when sunlight (white light) is refracted by water droplets

# data[].attributes.headline
When white light passes through a prism the different frequencies are refracted by different amounts, so the colours spread out and formed spectrum

# data[].attributes.subject
When white light passes through a prism the different frequencies are refracted by different amounts, so the colours spread out and formed spectrum

# data[].attributes.body
rainbow is formed when sunlight hits a rain droplet and some of the light are refracted.

# data[].attributes.headline
Reflected light from white light onto water/glass forms a spectrum 

# data[].attributes.subject
Reflected light from white light onto water/glass forms a spectrum 

# data[].attributes.headline
when sun light/white light hit a raindrop some light are reflected and a spectrum is formed

# data[].attributes.subject
when sun light/white light hit a raindrop some light are reflected and a spectrum is formed

# data[].attributes.headline
Rod cells can detect quite faint light, but do not detect different colors. There are three types of cone cells, they can detect red green and blue.

# data[].attributes.subject
Rod cells can detect quite faint light, but do not detect different colors. There are three types of cone cells, they can detect red green and blue.

# data[].attributes.body
rod cells are sensitive to dim and low light and are responsible for vision in dim and low light. cone cells are responsible for color vision.

# data[].attributes.headline
Rod Cells : Vision in dim/low light ; Cone Cells : Colour Vision

# data[].attributes.subject
Rod Cells : Vision in dim/low light ; Cone Cells : Colour Vision

# data[].attributes.headline
rod cell: detect amount of light, cone cell: detect colour of light

# data[].attributes.subject
rod cell: detect amount of light, cone cell: detect colour of light

# data[].attributes.headline
It is formed when the sunlight (white light) is split up by tiny drops of rain in the air.

# data[].attributes.subject
It is formed when the sunlight (white light) is split up by tiny drops of rain in the air.

# data[].attributes.headline
When sunlight hits a rain droplet, some of the light is reflected. The electromagnetic spectrum is made of light with many different wavelengths, and each is reflected at a different angle. Thus, spectrum is separated, producing a rainbow.

# data[].attributes.subject
When sunlight hits a rain droplet, some of the light is reflected. The electromagnetic spectrum is made of light with many different wavelengths, and each is reflected at a different angle. Thus, spectrum is separated, producing a rainbow.

# data[].attributes.headline
White light (sunlight) refracts off of water droplets, separating the 7 colors present in white light. Hence, a rainbow is formed.

# data[].attributes.subject
White light (sunlight) refracts off of water droplets, separating the 7 colors present in white light. Hence, a rainbow is formed.

# data[].attributes.headline
Rods enable vision in poor light, whereas cones are responsible for colour vision.

# data[].attributes.subject
Rods enable vision in poor light, whereas cones are responsible for colour vision.

# data[].attributes.headline
Rod Cells: Sensitive to dim light or low light and are responsible for vision in dim light.                              Cone Cells: Responsible for color vision, which detects red, green, blue colours

# data[].attributes.subject
Rod Cells: Sensitive to dim light or low light and are responsible for vision in dim light.                              Cone Cells: Responsible for color vision, which detects red, green, blue colours

# data[].attributes.headline
Rod cells detect low levels of light while the 3 kinds of cone cells (red, blue, green) interpret colors 

# data[].attributes.subject
Rod cells detect low levels of light while the 3 kinds of cone cells (red, blue, green) interpret colors 

# data[].attributes.body
rod cells + cone cells

# data[].attributes.headline
Rod cells can detect faint light, while the 3 types of cone cells detect red blue and green colours.

# data[].attributes.subject
Rod cells can detect faint light, while the 3 types of cone cells detect red blue and green colours.

# data[].attributes.body
1. Give a streamlined shape to the object
2. give a smooth surface to the object
3. Give a smaller size to the object

# data[].attributes.body
- a smooth surface
- smaller surface area
-stream-lined shape

# data[].attributes.body
Make sure the area of the object is small

Give the object a streamlined shape

Provide a smooth serface for the object

# data[].attributes.body
Giving the object a smooth object
Reduce the area that faces the air or water

# data[].attributes.headline
To reduce form drag, aircraft surfaces which are exposed to the airflow of the relative wind are streamlined. The remaining figures of the adjacent diagram show how, as the streamlining is increased, the form drag is decreased.

# data[].attributes.subject
To reduce form drag, aircraft surfaces which are exposed to the airflow of the relative wind are streamlined. The remaining figures of the adjacent diagram show how, as the streamlining is increased, the form drag is decreased.

# data[].attributes.body
- give the object a streamlined shape
- make the object smooth

# data[].attributes.body
1. Make the object more streamlined
2.Suck the boundary layer
3. Coat the object with a low friction layer (Teflon, wax)

# data[].attributes.headline
Keeping the area as small as possible, giving the object a streamlined shape and having a smooth surface.

# data[].attributes.subject
Keeping the area as small as possible, giving the object a streamlined shape and having a smooth surface.

# data[].attributes.headline
Drag is a force that slows a moving object down by creating friction and resistance force. There are two types of resistance: air resistance and water resistance. 

# data[].attributes.subject
Drag is a force that slows a moving object down by creating friction and resistance force. There are two types of resistance: air resistance and water resistance. 

# data[].attributes.headline
Force that slow things down when it’s moving through a liquid or a gas

# data[].attributes.subject
Force that slow things down when it’s moving through a liquid or a gas

# data[].attributes.headline
Drag is a force acting opposite to the relative motion of any object moving with respect to a surrounding fluid

# data[].attributes.subject
Drag is a force acting opposite to the relative motion of any object moving with respect to a surrounding fluid

# data[].attributes.headline
Drag is a resistance force that will slow down moving objects partly with friction 

# data[].attributes.subject
Drag is a resistance force that will slow down moving objects partly with friction 

# data[].attributes.headline
Firstly, keep the surface area as small as possible. Secondly, give the object a streamlined shape. Thirdly, give the object a smooth surface.

# data[].attributes.subject
Firstly, keep the surface area as small as possible. Secondly, give the object a streamlined shape. Thirdly, give the object a smooth surface.

# data[].attributes.body
1. Streamlined shape

2. Keep the area that faces the oncoming air or water as small as possible

3. Produce more force on the drag

# data[].attributes.body
- Make the object have a streamlined shape
- Reduce the area of the surface facing air/water

# data[].attributes.headline
Drag is a resistant force that will slow the moving object down by friction between the moving object and the fluid.

# data[].attributes.subject
Drag is a resistant force that will slow the moving object down by friction between the moving object and the fluid.

# data[].attributes.headline
It is a force that slows down objects with friction

# data[].attributes.subject
It is a force that slows down objects with friction

# data[].attributes.headline
Drag is a mechanical force. It is generated by the interaction and contact of a moving solid body with a fluid (liquid or gas). 

# data[].attributes.subject
Drag is a mechanical force. It is generated by the interaction and contact of a moving solid body with a fluid (liquid or gas). 

# data[].attributes.headline
Drag is a force that pulls an object to the back and slows it down from moving forward

# data[].attributes.subject
Drag is a force that pulls an object to the back and slows it down from moving forward

# data[].attributes.headline
It is a resistance force that slows than a moving object, caused by friction between the moving object and the fluid.

# data[].attributes.subject
It is a resistance force that slows than a moving object, caused by friction between the moving object and the fluid.

# data[].attributes.body
Drag is a resistance force that slows a moving object down

# data[].attributes.body
they are in the same size

# data[].attributes.headline
Weight(gravity) and upthrust, they are equal in size

# data[].attributes.subject
Weight(gravity) and upthrust, they are equal in size

# data[].attributes.headline
Gravity (weight) and upthrust. The force of weight is the same as the force of upthrust.

# data[].attributes.subject
Gravity (weight) and upthrust. The force of weight is the same as the force of upthrust.

# data[].attributes.body
Upthrust must be equaks to Weight

# data[].attributes.body
upthrust and gravity
same size

# data[].attributes.headline
Gravity and upthrust, they are equal in size

# data[].attributes.subject
Gravity and upthrust, they are equal in size

# data[].attributes.body
The two forces have the same size

# data[].attributes.headline
It is because there is less oxygen at high altitude, the oxygen is not enough for the mountaineers to use, so they need to carry tanks of oxygen so they can breathe.

# data[].attributes.subject
It is because there is less oxygen at high altitude, the oxygen is not enough for the mountaineers to use, so they need to carry tanks of oxygen so they can breathe.

# data[].attributes.headline
It is because there are not enough air for them to breathe in high place so that they need to get enough oxygen from the oxygen mask.

# data[].attributes.subject
It is because there are not enough air for them to breathe in high place so that they need to get enough oxygen from the oxygen mask.

# data[].attributes.headline
It is used to give air for that person, so they could breath well

# data[].attributes.subject
It is used to give air for that person, so they could breath well

# data[].attributes.headline
There is less air so also less oxygen for them to breathe, that’s why they have to wear an oxygen mask or they may not be able to breathe or it may be very hard to do so.

# data[].attributes.subject
There is less air so also less oxygen for them to breathe, that’s why they have to wear an oxygen mask or they may not be able to breathe or it may be very hard to do so.

# data[].attributes.headline
It is because the higher place you are in, the less air (air molecules) is above us. That’s why the air pressure will decrease.

# data[].attributes.subject
It is because the higher place you are in, the less air (air molecules) is above us. That’s why the air pressure will decrease.

# data[].attributes.headline
Since there are less air above us, the number of air particles is less around you Is less than the number of air particles in your body, so there is less pressure on you.

# data[].attributes.subject
Since there are less air above us, the number of air particles is less around you Is less than the number of air particles in your body, so there is less pressure on you.