How to make a cup of water without refrigeration equipment in a chemical reaction can also be frozen
Using barium hydroxide and ammonium nitrate effect is good, the combination can be frozen in a few minutes, the experiment many reagents, oneself buy is also easy to buy in chemical store
Then use some entropy great reaction to achieve. Such as ammonium carbonate/ammonium nitrate under the condition of alkaline dissolution, just so that thermal efficiency is not high.
In fact, all you need is a lighter, a straw, a glass of water and some salt. It is very simple, put some salt into the water, and then a finger seal one end of the straw, with the other end of the cigarette lighter to burn the straw, and then quickly insert the straw into the water, then leave the fingers open, after 5 seconds, quickly put the straw out of the water, so the water in the cup will be frozen in a few seconds. Sprinkle in May is NH4NO3 (ammonium nitrate, a kind of high nitrogen fertilizers, soluble in water can absorb tremendous amount of heat), a part of the high school and junior high school chemistry textbook of fertilizer has introduced). Note: may also be other salt, is not necessarily the ammonium nitrate. Conditions: water is close to zero, at room temperature was close to zero. Principle: because of the high thin tube burnt temperature giant, quickly into the water to cause NH4NO3 (ammonium nitrate) of dissolved, absorb a lot of heat, water freezes.
