Temperature is the degree of hotness or coldness of a body. The S.I unit of temperature is a kelvin (K).
A thermometer is an instrument which is used for measuring temperature on the basis of certain physical properties which change with changes in temperature.
These properties are called thermometric properties
A thermometric property is a property of a substance which continuously change with temperature and may be used for temperature measurements, these include:
-Increase in length.
-Change in potential difference
-Change in volume
-Change in pressure.
There are 3 thermometer scales commonly used
(i) Celsius / centigrade scale (0C)
(ii) Fahrenheit scale (0F)
(iii) Kelvin scale/ absolute (k)
Relation between Celsius and Fahrenheit
And if Celsius scale reads 1000c then
Converting from Fahrenheit to Celsius.
Relationship between Celsius scale and Kelvin scale
Where C is temperature in Celsius scale and K is temperature in Kelvin scale.
To obtain a standard scale on a thermometer. Two fixed points must be marked out on it. The upper and lower fixed points.