-273^circ C=underline ( )K 12K OK 9K 23K

To convert Celsius to Kelvin, we need to add 273.15 to the Celsius temperature.<br /><br />Given: $-273^{\circ }C$<br /><br />Step 1: Add 273.15 to the Celsius temperature.<br />$-273^{\circ }C + 273.15 = 0.15K$<br /><br />Therefore, $-273^{\circ }C$ is equal to $0.15K$.<br /><br />The correct answer is: 0.15K