1. What is the merit of cooling a place using AIR, a good insulating medium, with low thermal capacity?
2. If you want to empty a tank, do you pump it out or would you rather drain it?
3. Which heat transfer process would you choose: A or B?
   1. linearly proportional to temperature difference (i.e. doubling ∆ T = 2 x heat transfer rate)
   2. proportional to 4th power of temperature difference (i.e. doubling ∆ T = 16 x heat transfer rate)

Water presents a significantly higher heat transfer capacity:

• The multiplier of specific heat capacity and density for water vs. air is ~ 3400 (heat absorption per unit volume)
• The thermal conductivity multiplier for water vs. air is ~ 20 (heat transfer per unit area per unit thickness)