# Solids, Liquids and Gases FULL NOTES

These are my class notes for GCSE PHYSICS topic SOLIDS, LIQUIDS AND GASES.

If you learn these you're bound to get an A*

Good Luck!!

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- Paige

- Created by: Paige
- Created on: 27-01-14 18:44

First 368 words of the document:

Solids, Liquids and Gases

Density

SO what's density? Well, all solids, liquids and gases have different properties and characteristics.

One such characteristic is density. Solids are often very dense, liquids are less dense than solids, and

gases have very low densities. Density is how much mass something has for a certain volume in

other words, how `squashed up' something is.

To calculate density, use this equation:

Density = Mass/Volume

P = m/v

Example: A piece of iron has a mass of 390kg and a volume of 0.05m3. What is its density?

P = m/v

P = 390kg/0.05m3

= 7800kg/m3 Remember the unit! Density can be kg/m3, g/cm3...etc

Calculating Volumes for the Density

For a cuboid like this, simply multiply its length, width and height. I'm assuming

you know this, but if not, work up your maths man...

As for irregular solids, measure out a certain

amount of water with a measuring

cylinder. This is the control (something to

compare results to). Do the same with

another measuring cylinder, and drop the solid in. Note the rise in

the level of water. The difference between the two measurements

is the volume of the solid, in this case, 10ml.

Pressure

Pressure in Solids

Lets start like this: You can easily push a pin into a piece of wood quite easily, but it is pretty much

impossible to make a hole in the wood with your finger. You can try with little success (and end up with

splinters all over your fingers). Why is that? The small point of the drawing pin concentrates all your

pushing force into a tiny area, so the pin goes into the wood easily.

To get to the point, pressure is defined as the force per unit area. Force is measured in newtons (N)

and area is measured in square metres (m2). The unit for pressure is N/m2 or Pa (for Pascals).

Unfortunately, there is an equation that comes with pressure and this is ONLY FOR SOLIDS:

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