Of course in the case of snow it
cannot be higher than 0 deg. C. (32 deg. F.) But in some cases it is necessary
to start at a temperature below 0 deg. C. For instance, the temperature of
-49 deg. C. may be reached by mixing 1 part of snow with 1/2 part of dilute
nitric acid. But then the snow must have the temperature -23 deg. C. If it
were only at 0 deg. C., the depression would be only to about -26 deg. C.:
_________________________________________________________________
|
| The temperature sinks
Substances to be mixed in parts by |-------------------------
weight. | from | to
_______________________________________|____________|____________
| |
1. Water. 1 | +10 deg. C. | -15.5 deg. C.
Ammonium nitrate. 1 | |
2. Dil. hydrochloric acid. 10 | +10 | -17.8
Sodium sulphate. 16 | |
3. Dil. hydrochloric acid. 1 | +10 | -16
Sodium sulphate. 11/2 | |
4.
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