What does the candle weigh?

This task is about what happens to the wax of a candle when it is burning.

Question

burning candle on a scale weighing 29.71 grams

a)  A burning candle is put on a set of electronic scales.
After 30 minutes, the reading on the scales will be ...

    • less

    • more

    • the same

    • more or less depending on whether the candle has melted completely

Explain why