The result

How to make "Hiyaron"

First, I measure the ammonium nitrate 3g.
I measure the urea 3g.
A mixture of these two powders are put edge of zip-lock.
Second, I make a tissue dampened with distilled water.
This tissue is put on the opposite side of the powder.
I pulled out the air inside the zip-lock
ジップロックの中の水と粉末を混ぜ合わせます。

The result of the experiment

Before ２２℃
　↓
After １８．９℃