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When water is been evaporated it is less dense than the air so it floats in the air then the water drops get heavier as more water condenses into clouds than because obviously liquid water is more dense than dry air it falls to the ground.

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When you put some ice into your glass of Kool-aid after your done feasting on a bucket of KFC it will float to the top.

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Impact on the real world Of density of solid and liquid water 

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Impact on the real world Of density of solid and liquid water 

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Because of global warming ice is melting into the ocean. as the ice is melting it is causing the general level of the ocean to rise over time.

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Molecular level Of Density of solid and liquid water 

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Molecular level Of Density of solid and liquid water 

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When water freezes, water molecules form a crystalline structure maintained by hydrogen bonding. ice is less dense than liquid water. Ice is less dense than water because the orientation of hydrogen bonds causes molecules to push farther apart.

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Density is defined as the ratio between mass and volume or mass per unit volume. It is a measure of how much stuff an object has in a unit volume (cubic meter or cubic centimeter)

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Surface tension decreases as the temperature of the water goes up. Because the temp of the water goes up the molecules move faster disrupting the imbalanced forces on the surface of the water. Because of that it weakens the barrier lowering the surface tension. As water gets warmer it evaporates into the clouds later precipitated. It also increases the boiling point.

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Mountain climbers experience high altitudes making it colder, More hemoglobin in the blood means more viscosity. People at higher altitudes have thicker blood which could cause blood clots.

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The hydrogen atoms get attracted to other atoms making water cohesive  but other atoms want the hydrogen atom also so its like a tug of war on the surface the forces become weaker and weaker allowing the atoms to connect causing surface tension.

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How is Surface Tension Used in the Real World?

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How is Surface Tension Used in the Real World?

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Small insects can walk on water because their weight cant poke the surface.
Soap lowers the surface tension of the water so it can get into the pores of your clothes
Tents have drops of water on the outside to keep the water out if it rains.

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The tension of the surface film of a liquid caused by the attraction of the particles in the surface layer by the bulk of the liquid, which tends to minimize surface area.