TEMPERATURE AND PRESSURE MEASUREMENTS
Thermodynamics
Summary
The important information from this chapter is summarized below.
Temperature and Pressure Scales Summary
The 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 a
substance (or system).
The relationship between the Fahrenheit, Celsius, Kelvin, and Rankine temperature scales
was 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 °C
Conversions 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 + 273
Relationships between absolute pressure, gauge pressure, and vacuum can be shown
using the following formulas.
•
Pabs
= Patm + Pgauge
•
Pabs
= Patm - Pvac
HT-01
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