Mercury a terrestrial. It isn't made of gas.
Explanation:
A compass needle acts as a Magnet
Answer:
white star
Explanation:
because it is the hottest form of a star
Answer:
Option B, Fix the piston in place so the volume of the pas remains constant
Explanation:
As we know

The effect on variable due to another variable can be studied by keeping the third variable constant.
Hence, in order the study the variation of temperature with pressure or vice versa, the volume needs to fixed at a certain value.
Hence, option B is correct