NCERT Questions – 1

Conversion of Temperature from Kelvin to Celsius

To convert a temperature from Kelvin (K) to Celsius (°C), we use the formula:

$$T(°C)=T(K)-273$$

where:

• $T(K)$ is the temperature in Kelvin
• $T(°C)$ is the temperature in Celsius
• 273 is subtracted because 0°C = 273 K (freezing point of water in Kelvin scale)

Question (a)

(a) Convert 293 K to Celsius

Using the formula:

T(°C)=293−273

T(°C)=20∘C

So, 293 K = 20°C.

Question (b)

(b) Convert 470 K to Celsius

Using the formula:

T(°C)=470−273

T(°C)=197∘C

So, 470 K = 197°C.