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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…

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Pressure (in Pascals) = Force (in newtons)/Area (in square metres)
p = f/a

Example: A woman weighs 600N and the total area of her shoes in contact with the ground is
0.0015m2. Find the pressure she is exerting to the ground.
p = f/a
p = 600N/0.0015m2
= 400000Pa (or…

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= 1000kPa


And in words...

Boyle's Law: At a constant temperature and with a fixed mass of gas, pressure is inversely
proportional to volume.

Question: How does a gas exert a pressure on the walls of its container?

Billions of tiny air particles move about in continual random motion. Particle…

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We must first convert the temperature in Kelvin, so:

T1 = 20 + 273 = 293K (This is the temperature OUTSIDE the tin)
T2 = 50 + 273 = 323K (This is the temperature INSIDE the tin)
p1/T1 = p2/T2
100kPa/293K = p2/323K
p2 = 110kPa

Now to summarise the…

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