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History
Thermal expansion
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Thermal expansion is the tendency of matter to change its shape, area, volume, and density in response to a change in temperature, usually not including phase transitions.
Expansion joint in a road bridge used to avoid damage from thermal expansion.
Expansion joint in a road bridge used to avoid damage from thermal expansion.
Lord Kelvin, the namesake of the unit of measure
Lord Kelvin, the namesake of the unit of measure
Thermal expansion of long continuous sections of rail tracks is the driving force for rail buckling. This phenomenon resulted in 190 train derailments
Thermal expansion of long continuous sections of rail tracks is the driving force for rail buckling. This phenomenon resulted in 190 train derailments during 1998–2002 in the US alone.
Drinking glass with fracture due to uneven thermal expansion after pouring of hot liquid into the otherwise cool glass
Drinking glass with fracture due to uneven thermal expansion after pouring of hot liquid into the otherwise cool glass
Density
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Density is a substance's mass per unit of volume. The symbol most often used for density is ρ, although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume:
A test tube holding four non-miscible colored liquids with different densities
A test tube holding four non-miscible colored liquids with different densities