Gas Heat ESCO Practice Exam 2026 – Comprehensive All-in-One Guide for Exam Success!

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A BTU is the amount of heat required to raise the temperature of one pound of water:

one degree Celsius

one degree Fahrenheit

A BTU, or British Thermal Unit, is defined specifically as the amount of heat needed to raise the temperature of one pound of water by one degree Fahrenheit. While the definition provided aligns with the concept of a measure of heat, it is incorrect to suggest that it pertains to one degree Celsius. The climate sciences and heating industries primarily utilize Fahrenheit in the United States for measuring thermal energy in BTUs.

In this context, understanding the distinction in temperature scales is crucial. One degree Fahrenheit corresponds to a different increment of heat transfer compared to one degree Celsius, so claiming that a BTU equates to raising one pound of water by one degree Celsius misrepresents the unit's definition. The Kelvin and Rankine scales, while still relevant in scientific discussions, are not typically involved in the definition of a BTU concerning common heating applications.

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one degree Kelvin

one degree Rankine

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