Temperature is the measurement of heat intensity. The metric system uses degrees Celsius (°C) for normal use and Kelvin (K) for measurement in absolute terms. The Imperial system uses degrees Fahrenheit (°F) for normal use and degrees Rankine (°R) for measurement in absolute terms.
Temperature conversions are important when you are rating thermostats and air conditioning outlets. You also need to know the optimum temperatures of cooling systems, automotive fluids, and engines.
| Temperature Conversions | |
| 0°R = Absolute Zero | 0°K = Absolute Zero |
| 0°R = -459°F | 0°K = -273°C |
| 0°F = 459°R | 0°C = 273K |
| 0°F = -17.7°C | 0°C = 32°F |
| 100°F = 37.7°C | 100°C = 212°F |
