Joule per kilogram‑Kelvin (\\(\\text{J/(kg\\cdot K)}\\)) is the SI unit of specific heat capacity. It tells how many joules of energy are required to raise the temperature of one kilogram of a material by one kelvin.
British thermal unit per pound‑Fahrenheit (\\(\\text{BTU/(lb\\cdot °F)}\\)) is the Imperial‑customary counterpart. One BTU raises one pound of water by one degree Fahrenheit.
Practical Applications
Thermal analysis of fluids and solids in engineering design.
Energy budgeting for heating, ventilation, and air‑conditioning (HVAC) systems.
Material selection where heat capacity influences performance.
It quantifies the amount of energy required to raise the temperature of one kilogram of a substance by one kelvin. Higher values mean the material stores more thermal energy.
The factor is derived from exact definitions of the joule, BTU, kilogram, pound, kelvin and Fahrenheit degree. It is accurate to the listed 18‑significant‑digit value; rounding to fewer digits is common in practice.
"On fait la science avec des faits, comme on fait une maison avec des pierres ; mais une accumulation de faits n'est pas plus une science qu'un tas de pierres n'est une maison." "Science is built up of facts, as a house is built of stones; but an accumulation of facts is no more a science than a heap of stones is a house." — Henri Poincaré (French Mathematician, Theoretical Physicist & Mining Engineer)