Calories (15 °C, NBS 1939) to Btu conversion

There is more than one type of Btu. Please use the appropriate variation from the list below.

  1. Calories (15 °C, NBS 1939) to Btu (15°C)

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  2. Calories (15 °C, NBS 1939) to Btu (15.6°C)

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  3. Calories (15 °C, NBS 1939) to Btu (15.8°C, Canada)

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  4. Calories (15 °C, NBS 1939) to Btu (15.8°C, ISO)

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  5. Calories (15 °C, NBS 1939) to Btu (3.9°C)

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  6. Calories (15 °C, NBS 1939) to Btu (I.T.)

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  7. Calories (15 °C, NBS 1939) to Btu (I.T., pre-1956)

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  8. Calories (15 °C, NBS 1939) to Btu (mean)

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  9. Calories (15 °C, NBS 1939) to Btu (thermoc.)

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Calories (15 °C, NBS 1939)

The National Bureau of Standards (NBS, now known as The National Institute of Standards and Technology) defined the cal15 as being the ammount of energy needed to warm 1g of water from 14.5°C to 15.5°C

Btu

One BTU is the energy required to heat 1 avoirdupois pound of liquid water by 1 degree Fahrenheit, at a pressure of one atmosphere.