TEMPERATURE AND PRESSURE MEASUREMENTS

Figure 1 Comparison of Temperature Scales

Thermodynamics Heat Transfer and Fluid Flow Volume 1 of 3
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TEMPERATURE AND PRESSURE MEASUREMENTS Thermodynamics TEMPERATURE AND PRESSURE MEASUREMENTS Several types of temperature and pressure measurements are used during discussions of thermodynamics. Operators must recognize the different types and their interrelationships in order to understand thermodynamics. EO 1.3 DEFINE the thermodynamic properties temperature and pressure. EO 1.4 DESCRIBE the Fahrenheit, Celsius, Kelvin, and Rankine temperature scales including: a. Absolute zero temperature b. The freezing point of water at atmospheric pressure c. The boiling point of water at atmospheric pressure EO 1.5 CONVERT temperatures between the Fahrenheit, Celsius, Kelvin, and Rankine scales. EO 1.6 DESCRIBE the relationship between absolute pressure, gauge pressure, and vacuum. EO 1.7 CONVERT pressures between the following units: a. Pounds per square inch b. Inches of water c. Inches of mercury d. Millimeters of mercury e. Microns of mercury Temperature Temperature is a measure of the molecular activity of a substance. The greater the movement of molecules, the higher the temperature. It is a relative measure of how "hot" or "cold" a substance is and can be used to predict the direction of heat transfer. Temperature Scales The two temperature scales normally employed for measurement purposes are the Fahrenheit (F) and Celsius (C) scales. These scales are based on a specification of the number of increments between the freezing point and boiling point of water at standard atmospheric pressure. The Celsius scale has 100 units between these points, and the Fahrenheit scale has 180 units. The zero points on the scales are arbitrary. HT-01 Page 6 Rev. 0

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