> Dear sir/madam
> I am looking for some materials that must be meet the demand following:
> 1. These materials must be to discharge largely quantity of heat or to absorb
> largely quantity heat during phase change process.
> 2. The material must be largely obtained from marketing.
> 3. The material must be very cheap.
> 4. The material must be no harmful to environmental and human.
> I will be grateful very much if you can let me know above the material.
You might consider WATER.
peter sibbald at qucis.queensu.ca
