chapter 3: air temperature Flashcards
Temperature can be described as
the degree of hotness
or coldness
of a specific body.
The temperature of a body is the condition which determines its ability
to
transfer heat to other bodies or to receive heat from them.
The temperature of a body is the condition which determines its ability to transfer heat to other bodies or to receive heat from them. In a system of two bodies, the one which loses heat to the other is said to be at
a higher temperature.
Practical temperature scales are based on
fixed points
Practical temperature scales are based on fixed points. These are
constant and easily reproducible
Two internationally-agreed fixed points are the
melting point and the boiling point
The melting point is
the temperature at which pure ice melts under an external pressure of one standard atmosphere.
The melting point is the temperature at which pure ice melts under an external pressure of one standard atmosphere. This point is also called the
freezing point
The boiling point is
the temperature at which pure water boils under the one atmospheric pressure.
The main common temperature scales are:
Celsius (or the centigrade), Fahrenheit and Kelvin.
melting point of celsius
0
the boiling point for celcius
100
the melting point of fehrenheit
32
the boiling point of fahrenheit
212
the melting point of kelvin
273.15
the boiling point of kelvin
373.15
To convert temperature from Celsius value to the corresponding Fahrenheit value we can use the following formula:
F = 9/5 ( C)+32
To convert temperature from Fahrenheit to Celsius scale used the following formula:
C = 5/9 (F-32 )
The Celsius scale and Kelvin scale are related by the following formula:
K = C+ 273.15
Air temperature varies from
day to night
Air temperature varies from day to night, by the reason of
reason of the earth’s rotation around itself.
Air temperature varies from day to night, by the reason of the earth’s
rotation around itself.
Because of the continuous cooling during night by the
loose of the earth’s (terrestrial) radiation into the atmosphere minimum temperature is observed early morning (about one hour after sunrise).
Because of the continuous cooling during night by the loose of the earth’s (terrestrial) radiation into the atmosphere minimum temperature is observed early morning (about one hour after sunrise). Maximum temperature occurs at
about two hours after noon
Maximum temperature occurs at about two hours after noon. This is because
the atmosphere is heated from the earth’s surface.