Calories (15 °C, NBS 1939) to Btu (15.6°C) conversion formula
Btu (15.6°C) = Calories (15 °C, NBS 1939) / 251.96596444
Calories (15 °C, NBS 1939) to Btu (15.6°C) calculation
Btu (15.6°C) = Calories (15 °C, NBS 1939) / 251.96596444
Btu (15.6°C) = 1 / 251.9661869631
Btu (15.6°C) = 0.00397
Calories (15 °C, NBS 1939)
The 15 °C NBS 1939 calorie is the amount of energy required to raise the temperature of one gram of water by one degree Celsius, from 14.5 °C to 15.5 °C, at standard atmospheric pressure. This specific definition was established by the National Bureau of Standards (NBS) in 1939.
Btu (15.6°C)
The Btu (15.6°C) specifically refers to the energy needed to raise the temperature of water from 60°F (15.6°C) to 61°F.