Solids, Liquids and Gases

Question 1

What is density?

Answer 1

Density is how much mass (particles) there is in a given volume of an object. The more mass in an object, the greater the density.

Question 2

What is the equation to find density?

Answer 2

ρ = m / v

m = ρ X v
v = m / ρ

ρ = Density (kg/m^3)
m = Mass (kg)
v = Volume (m^3)

Question 3

When do objects float?

Answer 3

When they are less dense than water

Question 4

How do you measure the density of a liquid?

Answer 4

1. Set measure balance to zero and measure the mass of an empty measuring cylinder
2. Measure the mass of the measuring cylinder with liquid in
3. Subtract the mass of the measuring cylinder from the mass of the measuring cylinder + liquid
4. Measure the volume of the liquid in a measuring cylinder
5. Divide the mass from 3 by the volume

Question 5

What is pressure?

Answer 5

The amount of force acting per unit area

Question 6

How do you calculate pressure?

Answer 6

P = F / A

F = P X A
A = F / P

P = Pressure (Pascals, Pa)
F = Force (Newtons, N)
A = Area (M^2)

Question 7

How do you calculate pressure in a liquid?

Answer 7

P = hρg
ρ = P / hg
g = P / ρg
h = P / ρg

P = Pressure (Pascals, Pa)
ρ = Density (kg/m^3)
h = Height (m)
g = Gravitational field strength

Question 8

What creates a force upwards, what is it called?

Answer 8

A partially or totally submerged object experiences greater pressure on the top surface. This creates a resultant for upwards, the force is called upthrust

Question 9

What happens to the number of air molecules the higher you go?

Answer 9

There are less air molecules the higher you go.

Question 10

What can be used to find the pressure of a gas?

Answer 10

A manometer can be used to find the pressure of a gas

Question 11

What on a manometer shows the pressure?

Answer 11

The difference in the level of liquid on each side of the tube gives the difference in pressure