Pressure

Question 1

Which is always bigger than the other - Kelvin or degrees?

Answer 1

Kelvin

Question 2

What is absolute zero in Kelvin

Answer 2

0 K

Question 3

What is absolute zero in degrees

Answer 3

-273

Question 4

in ‘p1/t1 = p2/t2’ what do we assume?

Answer 4

• That the volume stays the same

- No gas leaks

Question 5

What is the formula for change in pressure?

△p

Answer 5

△p = ρgh

change in pressure = density x gravitational field strength x height

Question 6

What is pressure a measure of?

Answer 6

• How spread out a force is

Question 7

When increasing the size of the force, how does it affect the size of the pressure?

Answer 7

• It also increases it

Question 8

When increasing the size of the area, how does it affect the size of the pressure?

Answer 8

• It decreases it

Question 9

What is pressure measured in?

Answer 9

Pascals (P)

Question 10

What is force measured in?

Answer 10

Newtons (N)

Question 11

What is area measured in?

Answer 11

metres squared (m²)

Question 12

What is 1 Pascal?

Answer 12

1 Pascal is 1 Newton per metre squared (1N/m²

Question 13

What is the amount of pressure we are under from the atmosphere?

Answer 13

100,000 Pascals

Question 14

What is the formula involving force, area and pressure?

Answer 14

pressure = force / area

Question 15

What is the formula involving volume, pressure and mass?

Answer 15

pressure = mass / volume

Question 16

What is height measured in?

Answer 16

metres (m)

Question 17

What is density measured in?

Answer 17

Kilograms per metre cubed (kg / m3)

Question 18

What is gravitational field strength measured in?

Answer 18

Newtons per kilogram or metres per second squared

Question 19

In which direction does pressure act in a fluid?

Answer 19

• All directions

Question 20

Where does pressure come from in gases?

Answer 20

• It comes from the collisions between atoms or molecules and their container

Question 21

Where would the line of best fit cross on the x-axis if a graph of pressure against temperature is drawn?

Answer 21

• It would cross at absolute zero (0K or -273°C)

Question 22

What would happen to a gas if it was cooled down and why?

Answer 22

• It would liquefy as its particles lose energy and slow down

Question 23

What happens to particles at absolute zero?

Answer 23

• They all stop moving