5. Solids, liquids + gases

Question 1

What is the formula for pressure

Answer 1

Pressure = force /area

Question 2

If the area is in m^2 then the pressure is in

Answer 2

PASCALS or n/m2

Question 3

If area is in cm^2 then the pressure is in

Answer 3

N/cm2

Question 4

What is the formula for density

Answer 4

Density = mass/volume

Question 5

How do you find the volume for a regular shape

Answer 5

Volume = height x width x length

Question 6

What letter represents density

Answer 6

ρ (rho)

Question 7

How can you calculate the pressure in liquids

Answer 7

P = ρ x g x h
Where 
P = density of the water in pascals (=1000kg/m3)
g = the weight of 1kg (=10N/kg)
h = depth of water in metres

Question 8

Water pressure ….. as you go upwards and …. as you go downwards

Answer 8

Decreases

Increases

Question 9

units of density: mass (kg) goes with

Answer 9

m3

Question 10

units of density: mass (g) goes with

Answer 10

cm3

Question 11

formula for pressure difference

Answer 11

Pressure difference = height x density x gravitational field strength

Question 12

What temperature is absolute zero

Answer 12

0 kelvin (K) = -273*c

Question 13

How does pressure act in a liquid or gas at rest

Answer 13

equally in all directions

Question 14

How to work out the force being exerted on an object

Answer 14

force = mass x area

Question 15

how is the pressure of a gas measured

Answer 15

collisions of gas particles with the side of the container and each other create a force, which averaged over the billions of collisions per second is measured as the pressure fo the gas

Question 16

how does temperature affect the movement of particles in a gas

Answer 16

• an increase in temperature means the particles have more kinetic energy so move more, increasing the rate of their movement

Question 17

What is the specific heat capacity

Answer 17

The specific heat capacity is the amount of energy required to raise the temperature of 1kg
of a substance by 1℃ and is measured in Joules per kilogram degree Celsius (J/kg℃).

Question 18

equation for specific heat capacity

Answer 18

change in thermal energy = mass x specific heat capacity x temperature change
∆ = Q c m ∆ T