# Solids, Liquids and Gases

What you need to know for Soilds, liquids and gas section

• Solids, Liquids and Gases
• Density in regular Objects
• Volume is calculated using Depth x Width x Height
• Density= Mass/Volume
• Units are either kg/m3 or  g/cm3
• Density for irregular Objects
• Calculating volume for density: Measure out two cylinders and drop the object in one and the difference is the volume.
• Equation is the same for density of a regular object.
• Pressure in Solids
• Pressure= Force (Newtons) divided by Area ( in square meters
• P= F/A
• Pressure in Gases
• Three Ways to increase pressure in Gas:
• Heat It- There particles have more energy so it hits the wall with a bigger force.
• Squash it: The particles are being squashed togteher
• Due to the particles hitting the wall it exerts a force over and area which is pressure,
• Pressure in Fluids
• Boyles's Law
• Equation: Pressure 1 x Volume 1 = pressure 2 x Volume 2
• The Pressure Law
• Pressure 1 / Temp 1 = Pressure 1/ temp 1
• Always convert temperature to Kelvin adding 273
• Summarize: With a fixed mass of gas at a constant volume, pressure is proportional to temperature (in Kelvins).
• States of Matter
• Solids: Particles are closely packed, Regular structure and Vibrate about fixed positions
• Liquids: Particles are closely packed, Irregular structure and Random motion within structure.
• Gases:No fixed position, Move at rapid random motion and are very spread out