From what you have seen or read, list two examples each of thermal expansion in solids thermal expansion in liquids thermal expansion in gases

Thermal Expansion in Solids:

1. Railway Tracks: In hot weather, railway tracks can expand and buckle. This is why there are small gaps between sections of track, to allow for this expansion.
2. Bridges: Similar to railway tracks, bridges are also designed with expansion joints which allow the bridge to expand and contract with temperature changes.

Thermal Expansion in Liquids:

1. Mercury in Thermometers: The mercury in a thermometer expands and contracts with temperature changes, which is what allows it to measure temperature.
2. Hot Water Heater: When water is heated in a hot water heater, it expands. This is why many hot water heaters have an expansion tank to handle the increased volume of water.

Thermal Expansion in Gases:

1. Hot Air Balloons: The air inside a hot air balloon expands when heated, which causes the balloon to rise.
2. Natural Gas Pipelines: Natural gas pipelines need to be able to handle the expansion of gas when it is heated to prevent ruptures.