lämmönkasvu
Lämmönkasvu, a Finnish term often translated as "heat growth" or "thermal expansion," refers to the phenomenon where materials increase in volume when their temperature rises. Conversely, they contract when cooled. This change in size is a fundamental physical property of matter and is dependent on the material's composition and temperature range.
The extent of heat growth is quantified by the coefficient of thermal expansion, a material-specific constant.
In everyday life, heat growth is observable in various situations. A mercury thermometer works based on this