CONCEPT: - Temperature: It is the measure of the degree of hotness and coldness of a body.
- The SI unit of temperature is Kelvin
(K).
- The various temperature scales commonly used are Celsius (C), Kelvin (K), Fahrenheit (F), and Rankine (Ra).
-Celsius: It has
100 degrees between the freezing and boiling points of water.
- Here
0∘ represents the freezing point and
100∘ represents the boiling point. In many countries, celsius is used to communicate day to day temperatures.
- Fahrenheit:The Fahrenheit scale was proposed by physicist Daniel Gabriel Fahrenheit in 1724 .
This scale is primarily used in the United States and some Caribbean countries to communicate day to day temperatures.
- The temperature
T in degrees Fahrenheit
(‌∘F) is equal to the temperature
T in degrees Celsius
(‌∘C) times
9∕5 plus 32:
⇒‌∘F=‌C+32 CALCULATION: - The relation between the Celsius scale and Fahrenheit scale is given by
⇒‌=‌ By using the hit and trial method, suppose the
−40∘ the centigrade and Fahrenheit scales of temperature are the same i.e.,
F=C - The above equation can be written for
C, then
⇒‌=‌ ⇒5C−160=9C ⇒C=−40∘ And for Fahrenheit scales,
⇒‌=‌ ⇒5F−160=9F ⇒F=−40∘