Thermal insulation is a process through which the exchange of thermal energy (heat) between two physical systems (bodies or environments) is carried out through the interposition of a non-energy conducting material or material with insulating properties.
Any material that minimizes the transmission of heat (thermal exchange) between two physical systems may be considered thermal insulation in accordance with their conductivity coefficient (K) – the quantity of heat transferred per unit of length under a temperature differential (W/m.K). (heat exchange) between two physical systems can be considered as thermal insulation, according to their coefficient of conductivity (K) - amount of heat exchanged per unit of length under a temperature differential (W / mK).