(20 14? Linyi simulation) As shown in the figure, the piston cross-sectional area of the vertically placed cylinder is S=0.0 1m2, and it can slide in the cylinder without friction. Cylinder sidewall

① For the piston, there are: p0s+mg = p1s.

We can know from the meaning of the question: p1= P0+rhogh1.

Solution: m = ρ h1s.

Substitution value m=6.8? kilogram

(2) The piston position remains unchanged, and the volume of gas in the cylinder changes. When the temperature of the gas in the steel cylinder rises to 37℃, set the height difference h2 of the mercury column in the U-shaped tube.

T 1=280K，T 1=3 10K，p 1=p0+mgS，p2=p0+ρgh2

By p 1t 1 = p2t2

Substitute the data to get H2 =13.4cm.

Answer: ① piston mass m = 6.8kg

② When the gas temperature in the cylinder rises to 37℃, the height difference of the mercury surface in the U-shaped tube is 13.4? Centimeter.