14. Describe the phase change during:
Melting:
Boiling:
Condensing:
Freezing

Explanation:

Melting: it is a phase change from solid to liquid. It is usually attained when a substance reaches it melting point as heat is supplied to it. The vibrating particles break loose and begins to move like a liquid. Melting of iron is an example.

Boiling; is a phase change from liquid to gases. When substances reaches their boiling points when heat is supplied they begin to boil and form gases. An example is the boiling of water. Boiling usually occurs when the vapor pressure is equal to the atmospheric pressure around.

Condensing: is a phase change from gas to liquid. When gases are cooled they condense back to liquid. Example is rain clouds.

Freezing: is a phase change from liquid to solid.

d. temperate deciduous forest

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.