Question

Define

i) Thermal capacity ii) Water equivalent iii) Evaporation iv) Boiling
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Answer 1

Answer:

1. Thermal Capacity :

ratio of heat absorbed by a material to the temperature change. It is usually expressed as calories per degree in terms of the actual amount of material being considered, most commonly a mole (the molecular weight in grams).

2. Water Equivalent :

the product of the mass of a body by its specific heat equal numerically to the mass of water that is equivalent in thermal capacity to the body in question.

3. Evaporation :

the process by which an element or compound transitions from its liquid state to its gaseous state below the temperature at which it boils; in particular, the process by which liquid water enters the atmosphere as water vapour.

4. Boiling :

temperature at which the pressure exerted by the surroundings upon a liquid is equaled by the pressure exerted by the vapour of the liquid; under this condition, addition of heat results in the transformation of the liquid into its vapour without raising the temperature. 

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