30˚Celcius = ______ Kelvin (approximately)

303

The correct answer is option 2. 303.

To convert a temperature from Celsius to Kelvin, you add 273.15 to the Celsius temperature. This conversion is necessary because the Kelvin scale starts from absolute zero, where particles have minimal thermal motion. In contrast, the Celsius scale starts from the freezing point of water.

So, to convert 30˚ Celsius to Kelvin:

\[ 30˚C + 273.15 = 303.15 \text{ Kelvin} \]

Therefore, 30˚ Celsius is approximately equal to 303 Kelvin.