lämpölähteen
Lämpölähde is a Finnish term that translates to "heat source." It refers to anything that generates or releases thermal energy. In a broad sense, heat sources can be natural or artificial. Natural heat sources include the sun, geothermal activity within the Earth, and chemical reactions occurring in biological processes or geological formations. The sun is the primary source of heat for the Earth's climate and surface. Geothermal heat originates from the Earth's core and radioactive decay within its mantle.
Artificial heat sources are created by human activities or technologies. These can range from simple methods