7 Field Instrumentation GEN Rev)
Latent heat of vaporization: The amount of heat necessary to change a substance at the boiling point from liquid togas is called latent heat of vaporization.
Fusion: The change of physical state from liquid to solid is called fusion (or freezing.
Melting: The change of physical state from solid to liquid is called melting.
Latent heat of fusion: The amount of heat that must be removed as a substance changes
from a liquid to a solid, or added as the solid becomes liquid is referred to as the latent heat of fusion.
1.2 Temperature scales: Celsius: Melting point of ice is 0 and boiling point is 100. o
C = (
o
F – 32) / 1.8.
Fahrenheit: Melting point of ice is 32 and boiling point is 212. o
F = (1.8 * o
C ) + 32.
Kelvin: It is absolute scale. K = o
C +273.15.
Rankine: o
R = o
F +459.67
8 Field Instrumentation GEN Rev)
Absolute zero A hypothetical temperature at which a substance would have no thermal energy. Tabs o
C
Triple point The
temperature at which gaseous, liquid, and solid states of a substance exist simultaneously. For example, the triple point of mercury occurs at a temperature of −38.8344 C and a pressure of 0.2 mPa. THREE DIFFERENT
SCALES AND THEIR COMPARISONS 9 Field Instrumentation GEN Rev)
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