Which of the following is the best thermal insulator to reduce the transfer of heat by convection?
A. Air
B. Water
C. Alcohol
D. A vacuum

In an energy pyramid, which level has the most available energy?

How do i complete this electrolysis of water lab? i’m at home, so i don’t have the materials, and the lab didn’t properly work and was incomplete at school.

Give one example of a pure (exact) number and of an estimated (measured) number.