Convert the following temperatures to the Celsius scale:

(a) 293 K

(b) 470 K

(a) Kelvin is the SI unit of temperature. To change a temperature on the Kelvin scale to the Celsius scale you have to subtract 273 from the given temperature, and to convert a temperature on the Celsius scale to the Kelvin scale you have to add 273 to the given temperature.

Temp. on Kelvin scale= Temp. on Celsius scale + 273

293 = Temp. On Celsius scale + 273

Temp. on Celsius scale= 293- 273 = 20°C.

Therefore, 298 K is equal to 20°C.

(b) Kelvin is the SI unit of temperature. To change a temperature on the Kelvin scale to the Celsius scale you have to subtract 273 from the given temperature, and to convert a temperature on the Celsius scale to the Kelvin scale you have to add 273 to the given temperature.

Temp. on Kelvin scale = Temp. on Celsius scale + 273

470 = Temp. On Celsius scale + 273

Temp. on Celsius scale= 470- 273 = 197°C.

Therefore, 470 K is equal to 197°C.