Before revision: Ratios are not meaningful since 20 °C cannot be said to be "twice as hot" as 10 °C (unlike temperature in Kelvins ), nor can multiplication/division be carried out between any two dates directly.
After revision: Ratios are not meaningful since 20 °C cannot be said to be "twice as hot" as 10 °C (unlike temperature in kelvins ), nor can multiplication/division be carried out between any two dates directly.