The volume of a gas at 20°C is 100cm3 at normal pressure. If it is heated to 100°C, its volume becomes 125cm3 at the same pressure, then volume coefficients of the gas (at normal pressure) is?

If the temperature of a rod is increased by 10°C, its length increases by 1%. What is the percentage change in volume of the body of the same material for 10°C increase in temperature?

A.

9%

B.

1%

C.

5%

D.

3%

Answer: Option D

Explanation:

∆I/I×100=100α∆T ∆V/V×100=100γ∆T=100×3α×∆T Hence for the same rise of temperature, an increase in volume is 3 times the increase in length.