Which statement best defines temperature?

Which statement best defines temperature?

• A. A measurement of air density.
• B. A scale used to determine wind speed.
• C. A measure of how hot (or cold) something is.
• D. An instrument used to gauge humidity.

Answer: (C)

Temperature is a measure of how hot (or cold) something is. In HVAC work, it reflects the thermal energy level of a substance and is what a thermometer reads, using scales like Celsius, Fahrenheit, or Kelvin. It describes the current state of thermal energy, not the amount of matter or energy transfer itself. It isn’t air density, which depends on pressure and temperature in conjunction with composition; it isn’t a wind-speed scale (that's measured by an anemometer); and it isn’t a humidity gauge (that’s a hygrometer).

Temperature is a measure of how hot (or cold) something is. In HVAC work, it reflects the thermal energy level of a substance and is what a thermometer reads, using scales like Celsius, Fahrenheit, or Kelvin. It describes the current state of thermal energy, not the amount of matter or energy transfer itself. It isn’t air density, which depends on pressure and temperature in conjunction with composition; it isn’t a wind-speed scale (that's measured by an anemometer); and it isn’t a humidity gauge (that’s a hygrometer).