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When a submarine wants to submerge into the water it lets air escapes so that the submarine is heavier but when it wants to surface it will release air that is compressed in the sub and it will push the water out making it lighter as water has more density than air

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THE OBJECT THAT IS FLOATING SHOULD BE LESS DENSER THAN WHAT IT IS FLOATING ON

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THE EGG FLOATS IN SALT WATER AS THE SALT WATER IS MORE DENSE THAN THE EGG AS SALT WATER HAS MORE PARTICLES CONCENTRATED/COMPA-CT ON A REGION DUE TO THE ADDITIONAL SALT, MAKING THE EGG FLOAT.HOWEVER TAP WATER IS MORE DENSER THAN THE TAP WATER MAKING THE EGG SINK

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THE HOT AIR IN THE HOT AIR BALLOON HEATED UP BY THE BURNER IS LESS DENSER THAN ITS SURROUNDING AIR, SO THE AIR IS WILL BASICALLY FLOAT AND THE SAME TIME PUSHING THE SHEET OF THE HOT AIR BALLOON ALONG WITH IT

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The lava in the water is more dense than the water, allowing it to float above the water instead of dissolving into the water.

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The hot air balloon can float because when the burner heats up the air trapped inside the hot air balloon, the air inside becomes less dense than the air outside.

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Salt water is more dense than the egg while water is less dense than the egg thus the egg will float in salt water and sink in normal water.

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The salt water and the tap water have different densities and volumes. The salt water has a higher density while the tap water has a lower density. Making the egg sink in tap water as it happens to have a higher density than the tap water while it is the complete opposite when in salt water.

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Hot Air Balloon
When air in the hot air balloon is heated up by a burner, the volume of the hot air balloon increases and the density of hot air balloon decreases.Since that the density of hot air balloon is lower than the density of the surrounding air , it will rise and float in the sky.
Lava Lamp
The lava lamp is make of two liquids which is water and wax. They never get mixed because they have much different in density. There is a light bulb at the bottom of the lamp, when the wax reaches the bottom , it was being heated. So, it will expand and become less dense and volume will increase. This will cause the wax start to move upwards.The wax will slowly move back downwards when it loses heat.This repeat again as a process and become a cycle.
Egg In Salt Water
Egg will sink in tap water because the tap water is less dense than the egg. Egg will float in salt water because salt water is dense than the egg.

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The lava lamp has a light bulb located at the bottom of the lamp. As the 'lava' reaches the bottom, it gains heat and decreases in density, with volume increasing. Thus causing the 'lava' to move upwards, but to slowly drop back down as it loses heat. The process then becomes a cycle.

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The air heated by the burner in the hot air balloon decreased in density and increased in volume as the temperature rise, making the hot air balloon float in the sky as the surrounding air has a higher density.

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The only reason why the different liquids float and sink is because all of the liquids have different densities thus some will float and some will sink

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Salt water is denser than water, allowing the egg to float on salt water and not in regular water.

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The solid in the lamp quickly turns into liquid due to heat and expands, giving it a lower density than the surrounding liquid. The “blob” is now slightly less dense than the surrounding liquid so it rises to the top of the globe. The heat source is at the bottom of the globe, and since the “blob”cools, becoming more dense than the surrounding liquid, and sinks down to the bottom of the globe where the cycle starts again.

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The hot air in the balloon rises due to the difference of density between both hot and cold air particles. The hot air in the balloon is less dense than the cooler air surrounding the outer side of the balloon. Objects with lesser density would rise up above, causing the hot air balloon to rise.

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Since hot air rises it rises is pushes the hot air balloon when it is being heated

the salt water density is higher then the egg so the egg would float but in the tap water the density of the egg is lower then the water so it will sink

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a hot air balloon flys in the sky 'cause the burner heats up the air inside the balloon making it less than the surrounding air

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The heavier liquid absorbs the heat, and as it heats up, it expands. As it expands it becomes less dense. Because the liquids have very similar densities, the formerly heavier liquid is suddenly lighter than the other liquid, so it rises.

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When balloon absorb heat, it will expand and hot air rises so balloon will rise itoair

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When balloon absorb heat, it will expand and hot air rises so balloon will rise itoair

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the salt water's density is higher than the egg's density so the egg will float . However, the water's density is lighter than the egg ,therefore the egg will sink

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hot air balloon rises because there are air trapped in the balloon which is heated by a burner

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The heat usually comes from a light bulb. The heavier liquid absorbs the heat, and as it heats up, it expands. As it expands it becomes less dense. Because the liquids have very similar densities, the formerly heavier liquid is suddenly lighter than the other liquid, so it rises.

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Wood is less dense than water, so it will float.

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The lava in the water has more density than the water, causing it to float in the water and not dissolve with the water

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The hot air balloon float in the air because when the burner heats up the air trapped inside the hot air balloon making the air trapped inside less dense than the air outside

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the egg is more dense than water but less dense than salt water

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When the air in the hot air balloon is heated, the volume of the hot air balloon increase and the density of the hot air balloon decreases, thus it is lower than the density of the surrounding air, causing the hot air balloon to rise and float in the sky

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Salt water is denser so the egg would float instead of sinking

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When air in the balloon is heated, the volume of balloon increases and the density of balloon decreases.

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the egg is more dense than the tap water but less dense than the salt water

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When placed in tap water, the egg has a higher density of the water in the glass. If enough salt is added, the density of the water will become higher than the egg, causing it to float

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In a lava lamp, there are two substances of different densities mixed together. Liquids of different densities do not mix. Thus different layers of substances are formed.

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Sharks have oil-filled liver to help them float in water as gravity pulled them down since oil is less dense than water.unlike fishes with gas-filled bladders,sharks rely on a large liver filled with oil which contains squalene and their cartilage which is half the normal density of bone.but still the shark is heavier than water so the sharks will non-stop swimming to keep itself floating.

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When air in the hot air balloon is heated, the volume the hot air balloon will increase and the density of the hot air balloon will decrease. Since the density of the hot air balloon is lower than the density it will rise and float in the air

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Hot air is less dense than cool air; the heated air causes the balloon to rise simply because it is lighter than an equal volume of cold air. Buoyancy is an upward force that the air exerts, and it helps hot-air balloons and blimps stay in the air. A hot air balloon uses a burner to heat up the air inside the balloon.

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When enough salt is added to the water, the saltwater solution's density becomes higher than the egg's, so the egg will then float .The ability of something, like the egg, to float in water or some other liquid is known as buoyancy.

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In a liquid motion lamp, the heat usually comes from a light bulb. The heavier liquid absorbs the heat, and as it heats up, it expands. As it expands it becomes less dense. Because the liquids have very similar densities, the formerly heavier liquid is suddenly lighter than the other liquid, so it rises.

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The egg sinks as the density of the egg is greater than that of the tap water but when it comes to salt water, the egg density is lesser than the salt wter thus it will float on the surface of the salt water.

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when the hot air balloon heats up and traps air, the balloon will have  more water pressure this will help to push the balloon upwards thus the more weight it can carry

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the density of all the liquids in the lava lamp are similar thus they can move around easily and change where they are

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The ability for the lamp oil to float on the Rubbing Alcohol because the Lamp oil is less dense than the Rubbing Alcohol.This also include the other liquids as well and the have different  densities

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the density of the egg of the egg is higher than the water thus it will sink in water but floats in salt water

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When there is hot air, balloon will rise and it would also expand.

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Salt water is denser than water so egg will float on saltwater compared to sinking in water .

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The liquid in the lava lamp absorbs the heat from the light bulb , as it gains heat , it expands and become less dense

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A hot air balloon float because the air trapped inside the balloon is heated up by a burner , making it less dense than the air outside

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The egg floats in salt water as it is less dense than the salt water.

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A hot air ballon works as it is less dense than the air.

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A lava lamp works by having a substance of a higher density mixed with a substance of a lower density.

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Explain how lava lamp works.

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Explain why egg sinks in water but float in salt water.

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Explain how a hot air balloon works.

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Density = Mass / Volume
For a constant mass object, as
Volume increases, density decreases.
Volume decreases, density increases.

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In the lamp, the heat source usually comes from a light bulb. They heavier liquid absorbs the heat from the light bulb and expands due to the heat. As it expands, the liquid becomes less dense, and because of the similar densities both liquids have, the initial heavier liquid would be lighter than the other liquid, making it rise and form blobs that make lava lamp

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In the lamp, heat usually comes from the light bulb. The heavier liquid absorbs the heat from the light bulb and e