Figure 1 Comparison of Temperature Scales

TEMPERATURE AND PRESSURE MEASUREMENTS

Temperature Scale Conversion

Thermodynamics Heat Transfer and Fluid Flow Volume 1 of 3
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Thermodynamics TEMPERATURE AND PRESSURE MEASUREMENTS The freezing point of water was selected as the zero point of the Celsius scale. The coldest temperature achievable with a mixture of ice and salt water was selected as the zero point of the Fahrenheit scale. The temperature at which water boils was set at 100 on the Celsius scale and 212 on the Fahrenheit scale. The relationship between the scales is represented by the following equations. °F = 32.0 + (9/5)°C (1-5) °C = (°F - 32.0)(5/9) (1-6) It is necessary to define an absolute temperature scale having only positive values. The absolute temperature scale that corresponds to the Celsius scale is called the Kelvin (K) scale, and the absolute scale that corresponds to the Fahrenheit scale is called the Rankine (R) scale. The zero points on both absolute scales represent the same physical state. This state is where there is no molecular motion of individual atoms. The relationships between the absolute and relative temperature scales are shown in the following equations. °R = °F + 460 (1-7) °K = °C + 273 (1-8) Figure 1 Comparison of Temperature Scales Rev. 0 Page 7 HT-01

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