CELSIUS, FAHRENHEIT AND KELVIN

Celsius (°C),  Fahrenheit (°F) and Kelvin (K) are units of recording temperature.

The Fahrenheit was proposed by Daniel Gabriel Fahrenheit. The scale is often mispelled as "farhenheit", "farenheit", "farhenhiet", or "farenhiet".

The Celsius scale is still sometimes called the "centigrade" scale because it is divided into 100 divisions. It was devised by Andres Celsius.

The Kelvin scale is named after the Belfast-born, Glasgow University engineer and physicist William Lord Kelvin (1824–1907),

FORMULA

Examples:

Convert the following as instructed:

(i) 45°C into Fahrenheit

(ii) 95°F into Celsius

(iii) 54°C into Kelvin

(iv) 350.15 K into Celsius

(v) 300.15 K into Fahrenheit

Solutions:

(i) 45°C into Fahrenheit

Formula:

Therefore:      °F    = (45°C  x ⁹/₅)+32

                                 = 81 + 32

                                  = 113°F

(ii) 95°F into Celsius

Formula:

Therefore:      °C  = (95°F  - 32) x ⁵/₉

                          = 63 x  ⁵/₉

    = 35°C

(iii) 54°C into Kelvin

Formula:

Therefore:      K  = 54°C + 273.15

                          = 327.15K

(iii) 350.15 K into Celsius

Formula:

Therefore:      °C = 350.15 - 273.15

                          = 77°C

(i) 300.15 K into Fahrenheit

     Convert 300.15k into Celsius

    °C = (300.15 - 273.15) = 27°C then convert

     Celsius you get into Fahrenheit as below:

°F  = (27°C  x ⁹/₅)+32

      = 48.6 + 32

      = 80.6°F

Try yourself:

(i) 23°C into Fahrenheit

(ii) 122°F into Celsius

(iii) 41.85°C into Kelvin

(iv) 298.45K into Celsius