Pressure

Question 1

Pressure in Gasses Equation

Answer 1

Pressure = Force/Area
P = F/A

Question 2

Units

Answer 2

N/m²
Pascals (Pa)
Atmospheres (bar)

Question 3

Boyle’s Law

Answer 3

P x V = Constant
P1V1 = P2V2
For a fixed mass of gas at a fixed temp
The volume decreases, the distance each particle travels between the walls decreases, no. of collisions per second increases, average force on walls increases so the pressure increases

Question 4

Pressure Law

Answer 4

P/T = constant
For fixed mass and volume of gas and temperature in Kelvin
As the gas heats up: the particles move faster so they collide with the walls more often and with more force so the pressure increases.

Question 5

Absolute Zero

Answer 5

Temp. at which gas pressure is theoretically zero (particles stop moving). Minimum possible temperature.
0 Kelvin = -273 degrees C

Question 6

Kelvin

Answer 6

temp in degrees + 273

Question 7

Pressure law

Answer 7

At constant volume P/T =Constant (P1/T1 =P2/T2) TEMP HAS TO BE IN KELVIN

Question 8

Adiabatic Compression

Answer 8

Adiabatic: compressed quickly so no TE is transferred to the environment during compression.
As the air is compressed rapidly, its temperature goes up.
In fridges the reverse happens-gas is allowed to expand and it cools down.