Is there any substance with bigger volumetric heat capacity than water? According to this table water has the biggest known VHC. But I can't believe that in the 21. century we have no special material with larger VHC.
[Physics] Greatest volumetric heat capacity
heat
Related Solutions
is a design that gets the maximum efficient use of energy for cooking and needs a minimum of heat source.
A flat bottom equivalent pan transfers the heat to the food from the bottom plane, and the walls are just containers radiating most heat away, since the food is at the bottom. A Wok focuses the heat from the walls to the food being cooked ( think of a parabola and its focal point). The walls partake in the cooking process effectively giving more area contact to the food than the flat bottom one.
There are two ways to think about the temperature of air.
One way is to measure the distribution of air molecule velocities, and relate this to a temperature using the Maxwell-Boltzmann distribution. However no (reasonable) amount of messing around with sound waves is going to reproduce a Maxwell-Boltzmann distribution.
The other way is to say air is hot if it heats things it's in contact with. The heating is due to transfer of energy from the air molecules to vibrational modes in the object being heated. If you generate a sound wave then that wave carries energy so it will heat anything that absorbs the sound. If you look at things this way then using sound waves to make the air hot is really easy since any old sound wave does it. All you need is to put enough energy into the sound, i.e. make it loud enough, to transfer the required energy to whatever it is you're heating.
Best Answer
Here is a thesis that details construction and characterization of thin films with large volumetric heat capacities (some nearing $6\ MJ\cdot m^{-3}K^{-1}$):
Volumetric heat capacity enhancement in ultrathin fluorocarbon polymers for capacitive thermal management