Thermodynamics is a branch of Science which deals with change in temperature, heat energy and work. Temperature change or heat energy plays a very important role in our lives as we observe how our body reacts to heat in summer or cold in winter. The study of the behavior of atoms or molecules in different surroundings with respect to various macroscopic quantities such as pressure, temperature, entropy etc. is called Thermodynamics.
Example 1: The boiling point of water in Celsius is 100°C. What is this temperature in Fahrenheit?
Solution: Conversion formula from Celsius to Fahrenheit: °F = [(C * 9)/ 5] + 32
This gives: °F = [(100 * 9)/ 5] + 32
Therefore, °F = (20 * 9) + 32 = 180 + 32 ==> °F = 212.
Hence the boiling point of water in Fahrenheit = 212°F
Example 2: The temperature of an object in Kelvin is 298K. What is the temperature of the object in Celsius and in Fahrenheit?
Solution: Conversion formula from Kelvin to Celsius: °C = K – 273.
This gives: °C = 298 – 273 ==> 25°C.
Hence the temperature in Celsius = 25°C.
Conversion formula from Celsius to Fahrenheit: °F = [(C * 9)/ 5] + 32
This gives: °F = [(25 * 9)/ 5] + 32
Therefore, °F = (5 * 9) + 32 = 45 + 32 ==> °F = 77
Hence the temperature in Fahrenheit = 77°F