Temperature refers to the degree of coldness or hotness of a body at a particular time. The SI unit of temperature is Kelvin (K) known as absolute zero or thermodynamic scale.
Temperature is property of a body, which decides which way heat will flow when it is placed in contact with another body.
The device used to measure temperature is called thermometer
Commonly in thermometers we encounter the unit Celsius degree (0C) another scale is called Fahrenheit scale.
Conversion of Celsius degree (0C) to
Absolute zero or thermodynamic scale (Kelvin (K) Scale)
K = ˚C + 273
Conversion of Celsius degree (˚C) to
Fahrenheit scales (F) and vice versa
F = 9/5 x ˚C + 32
˚C = 5/9 x (F-32)
Example 1
Convert 25˚C into Absolute scale.
Solution
K = ˚C + 273
= 25˚C + 273
= 298 K
Therefore 25˚C = 298 K
Example 2
Express 104 F as Celsius degree
Solution
˚C = 5/9 x (F-32)
= 5/9
x (104-32)
= 5/9
x 72
= 5 x 8
= 40 ˚C
Therefore 104 F = 40 ˚C
No comments:
Post a Comment