Question

Explain the following
gases exert pressure
evaporation causes cooling
solid can be converted to lizuid​

Answer 1

Explanation:

(a) The Particles in gases are loosely packed and have high kinetic energy and due to this they move with a high speed in random direction due to this random motion of the particle they hit the walls of the container an thus, exert pressure.

2.It is because the freezing point of the water is  less than the room temperature and also the boiling point of the water is very above the room temperature. This makes the water to exist in the liquid state.....

3.Evaporation causes cooling because water requires heat to evaporate so when it evaporates it take heat from surroundings which makes surrounding cooler....

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Answer 2

Explanation:

1. The molecules are continually colliding with each other and with the walls of the container. When a molecule collides with the wall, they exert small force on the wall The pressure exerted by the gas is due to the sum of all these collision forces. The more particles that hit the walls, the higher the pressure
2. Evaporation causes cooling because the process requires heat energy. The energy is taken away by the molecules when they convert from liquid into gas, and this causes cooling on the original surface.
3. solid can be converted into a liquid by heating.. The atoms in a liquid have more energy than the atoms in a solid. There is a special temperature for every substance called the melting point. When a solid reaches the temperature of its melting point, it can become a liquid...

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