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26 terms

Geology C-3

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absolute zero
(cryogenics) the lowest temperature theoretically attainable (at which the kinetic energy of atoms and molecules is minimal)
annual mean temperature
Average of the 12 monthly means
annual temperature range
computed by finding the difference between the warmest and coldest monthly mean temperatures
bimetal strip
A thermometer consisting of two thin strips of metal welded together and that have widely different coefficients of thermal expansion. When temperatures change the two metals expand or contract unequally and cause changes in the curvature of the element.
Celsius Scale
a temperature scale that defines the freezing point of water as 0 degrees and the boiling point of water as 100 degrees
Controls of Temperature
Factors that cause temperature to vary from lace to place ad from Time to Time.
cooling degree - day
The amount of power required to cool a building defined in an index. Determined by subtracting 65 degrees F from the daily mean.
daily mean temperature
determined by averaging the 24 hourly readings, or more frequently, by adding the maximum and minimum temperatures from a 24 hour period and dividing by 2.
daily temperature range
computed by finding the difference between the daily maximum and minimum temperatures
Fahrenheit Scale
Scale where, a temperature scale that defines the freezing point of water as 32 degrees and the boiling point of water a 212 degrees
fixed points
Reference points, like the steam point and the ice point, used in the construction of temperature scales.
growing degree - day
Agricultural application of temperature data to determine the appropriate date when a crop will be ready to harvest.
heating degree - day
represents a practical method for evaluating energy demand and consumption. The degree of temperature below 65 degree F. is counted as 1 heating degree
ice point
the melting point of ice (32 degrees)
isotherm
line that connects points on a map that have the same temperature. Iso=equal; therm=temperature. Therefore, all points through which an isotherm passes have identical temperatures for the time period indicated.
Kelvin or absolute scale
temperature scale wherein the ice point is 273 and the steam point at 373 and zero point represents the temperature at which all molecular motion is presumed to cease called absolute zero. It is not possible to have a negative temperature
liquid in-glass thermometer
Thermometer designed in the 1600's wherein the rising temperatures cause the molecules of fluid to become more active and spread out (expansion) at a faster rate than the enclosing glass.
maximum thermometer
Specially designed in-glass thermometer wherein Mercury is used as the liquid., specially modified mercury thermometer that measures the maximum temp. attained in a given period of time
minimum thermometer
An in-glass thermometer which contains alcohol Records Minimum temperature in a given period of time
monthly mean temperature
total daily mean temperatures of the month divided by the number of days in the months
specific heat
the heat required to raise the temperature of one gram of a substance one degree centigrade. Water requires 3 times more heat than land.
steam point
The point at which water at standard pressure boils
temperature gradient
change in temperature as a function of distance (especially altitude)
thermistor
a semiconductor device made of materials whose resistance varies as a function of temperature
Thermograph
instrument that measure temperature changes by recording the movement of the bar of a bimetal thermometer
thermometers
meters of therms - mechanical or electrical devices used to measure temperature