I had written a letter to newsgroups, bionet.molec-model, 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 am grateful very much to the answer of friends. Yes, water is high heat
capacity, very cheap and environmentally friendly, but I will use the looked
for material to treat water, so I am looking for a material except the water.