Download - Properties of solids, liquids and gases
Properties of solids, liquids and gases
Can you stick the sheet in please?
Solids?
Solids
• Fixed shape
• Cannot flow
• Difficult to squash
• Can’t change volume
• Usually “feel” heavy
Liquids?
Liquids
• Shape can change
• Can flow
• Not easy to squash
• Cannot change volume
• Generally “feel” heavy
Gases?
Gases
• Shape can change
• Can flow
• Easy to squash
• Can change volume
• “Feel” light
Why?
The particles in a solid are close together.
The particles in a solid cannot move around, but they can vibrate.
The particles in a liquid are also close together.
The particles in a liquid also vibrate and can move around.
The particles in a gas are far apart.
The particles in a gas are moving very quickly.
For the same substance (e.g. water), the particles are the same size in the solid, liquid or gaseous forms.
Melting point of wax?
Table of results
Time (mins) Temp of wax (°C)
Cooling curves
The temperature stays the same during a change of state (melting, boiling etc.)
Time (mins)
Temp (°C)
Melting point
liquid
solid
solidifying
Melting points
The melting point is the same as the temperature that a liquid solidifies (turns back into a solid). For example ice melts at 0°C but water also freezes at 0°C.
Pressure in a gas?
http://phet.colorado.edu/sims/ideal-gas/gas-properties.jnlp
Pressure in a gas
• The particles collide with the sides of the container creating a force we call pressure.
http://phet.colorado.edu/sims/ideal-gas/gas-properties.jnlp
Diffusion?
Diffusion?
• The random movement of gas partciles cause them to spread out from areas of high concentration to areas of low concentration.