Briefly answer the following: (a) If someone says that temperature is how hot or

Question

Briefly answer the following:

(a)    If someone says that temperature is how hot or cold it feels, would you agree?

(b)   If heat energy is transferred from room A to room B, can you automatically conclude that A must have a higher temperature than B?

(c)    Why can’t you buy a thermostat with water as a working substance?

(d)   Two gases are at the same temperature and pressure. Do they have the same internal energy and particle speed? (Be careful what you assume.)

(e)   On a cold day you could rub your hands together to warm them up a bit. What is transferred to the hands, heat or work?

(f)       Why is it necessary to distinguish heat capacity for constant volume or constant pressure?

(g)    When a gas expands isothermally under constant pressure, how does the enthalpy change?

(h)   If the speed of gas particles decreases, how does the mean free path change? Mean collision time?

(i)      If the gas particle density is doubled, how does it affect thermal conductivity?   

Explanation / Answer

(a) Yes, it is the degree of hotness or coldness (b) Yes, heat always transfer between hot body to cold body. (c) No, because it is a poor conductor of heat (d) No, not necessary (e) Work . Here work changes to kinetic energy. (f) Heat capacity for constant volume is more than that of constant pressure because there is no work done in the case of constant volume. (g) It increases (h) Mean free path reduces and collision time increases (i) cannot affect thermal conductivity

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