1. The problem is to find the temperature in Kelvin when aluminum melts, given that aluminum melts at 660.3 degrees Celsius. 2. To convert Celsius to Kelvin, use the formula: $$K = ^\circ C + 273.15$$ 3. Substitute the melting point of aluminum: $$K = 660.3 + 273.15$$ 4. Calculate the sum: $$K = 933.45$$ 5. Therefore, the melting point of aluminum in Kelvin is $933.45$ K.