TEMPERATURE AND PRESSURE MEASUREMENTSThermodynamicsSummaryThe important information from this chapter is summarized below.Temperature and Pressure Scales SummaryThe following properties were defined as follows.• Temperature is a measure of the molecular activity of a substance.• Pressure is a measure of the force per unit area exerted on the boundaries of asubstance (or system).The relationship between the Fahrenheit, Celsius, Kelvin, and Rankine temperature scaleswas described.• Absolute zero = -460 °F or -273 °C• Freezing point of water = 32 °F or 0 °C• Boiling point of water = 212 °F or 100 °CConversions between the different scales can be made using the following formulas.• °F = 32 + (9/5)°C• °C = (°F - 32)(5/9)• °R = °F + 460• °K = °C + 273Relationships between absolute pressure, gauge pressure, and vacuum can be shownusing the following formulas.• Pabs= Patm + Pgauge• Pabs= Patm - PvacHT-01 Page 12 Rev. 0
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