Suppose you compress a gas in a cylinder with a piston by pushing down on the piston. What is the best explanation for why the gas gets warm?

W) The decrease in volume at constant pressure increases the temperature

X) By compressing the gas, you do work on it, which is converted into heat

Y) By compressing the gas, you increase its entropy, resulting in a negative free energy

Z) The gas will start to condense, releasing energy
X) BY COMPRESSING THE GAS, YOU DO WORK ON IT, WHICH IS CONVERTED INTO HEAT15) Earth and Space - Short Answer What phase of a star's lifetime on the HR diagram involves a hydrogen shell burning around an inert helium core?