The air in a cylinder of a diesel engine occupies 1.00 L at 30 degrees celsius and 1.00 atm. What is the pressure in the cylinder when the air is compressed to 0.0714 L (14:1 compression ratio) and heats to 480 degrees celsius? When the fuel explodes in the compression chamber, the temperature increases to 2,000 degrees celsius for an instant. What is the pressure of the gases in the cylinder at this instant before expansion occurs?

For this problem would I just add the two pressures (1+.0714) together? I'm pretty sure I'm completely wrong.

1 answer

a.
Use (p1v1/t1) = (p2v2/t2)
p1 = 1 atm
v1 = 1 L
T1 = 30 + 27 = ?Kelvin
P2 = ?
V2 = 0.0714 L
T2 = 480 + 27 = ?Kelvin.

b part is done the same way.