Density and Pressure

Question 1

What is pressure?

Answer 1

How much force is put on a certain area.

Question 2

What is the formula for pressure?

Answer 2

Force/Area

Question 3

What is force measured in?

Answer 3

Newtons (N)

Question 4

What is area measured in?

Answer 4

Metres squared (m²) or centimetres squared (cm²)

Question 5

What is pressure measured in?

Answer 5

Newtons per metre squared (N/m²) or newtons per centimetre squared (N/cm²).

Question 6

What is 1 N/cm² in N/m²?

Answer 6

10000 N/m²

Question 7

Do you exert more pressure standing on one or two feet?

Answer 7

One, because the area is lower.

Question 8

How do you find the force of an object?

Answer 8

Weigh the object on a Newton meter, or weigh it and times the object by 10 (mass to weight).

Question 9

What is a Pascal?

Answer 9

1 N/m²

Question 10

How do you calculate the area of an object?

Answer 10

Outline the object on a piece of centimetre-squared paper, and count how many squares are inside the shape.

Question 11

When there is a set force, what does decreasing the area do?

Answer 11

Increase the pressure.

Question 12

How do skis work?

Answer 12

It increases the area of your foot, so the pressure decreases, meaning you don’t sink.

Question 13

What is density?

Answer 13

A measure of the compactness of a substance.

Question 14

What is the formula for density?

Answer 14

Mass/volume.

Question 15

What are the values for density?

Answer 15

g/cm³ or kg/m³

Question 16

What is 1 g/cm³ in kg/m³?

Answer 16

1000kg/m³

Question 17

How could you find the mass of solids?

Answer 17

Using a mass balance.

Question 18

How could you find the volume of something irregularly shaped?

Answer 18

Measure out a certain volume of water in a beaker, and then add the object. Measure the now changed volume of water. Subtract the first measurement from the second, and that’s the volume of the object.

Question 19

How could you find the volume of something regularly shaped?

Answer 19

Multiply the 3 dimensions of the object.

Question 20

How could you find the mass and volume of a liquid?

Answer 20

Take an empty beaker and measure it. Then add the liquid, and the change in the number is the mass. Read off the beaker to find the volume.

Question 21

Does a less dense liquid float on a more dense liquid?

Answer 21

Yes

Question 22

What are immiscible liquids?

Answer 22

Liquids that don’t mix together.

Question 23

How can you test the density of two immiscible liquids?

Answer 23

Add equal amounts of the liquids to a beaker. Then wait, and the liquids will form different layers. The liquid on the top layer is less dense than the bottom one.

Question 24

How is density affected?

Answer 24

By the way the particles are arranged.

Question 25

Usually, what are the most, middle and least dense states?

Answer 25

Solids, liquids and gases.

Question 26

What happens when you heat a substance?

Answer 26

The particles move further apart, which could cause a change in state. This means the density will be lowered.

Question 27

What would happen if you mix warm and cold water?

Answer 27

The warm water would float above the cold water.

Question 28

What happens when you decrease the temperature of water?

Answer 28

The particles get spread out more.

Question 29

Is water more dense than ice?

Answer 29

Yes

Question 30

How could you measure the density of a gas?

Answer 30

Find the mass of a deflated balloon, and then inflate it with the gas, and re-measure the mass. The put the balloon in a container of water, and the volume change is approximately equal to the volume of the gas. Divide the mass with the volume to get the density.

Question 31

What is approximately the density of air?

Answer 31

0.001 g/cm³