| Coolant |
Temperature |
Comments |
| Ice Bath |
0
- 5 o C |
It
is important to have a crushed ice - water mixture to ensure good
conduction. |
| Crushed
Ice - CaCl2.6H2O (2.5:1) |
-10
o C |
These
baths are 'dry' mixtures and so conduction of heat away from a vessel
wiill be inefficient. |
| Crushed
Ice - NaCl (3:1) |
-20
o C |
| Crushed
Ice - CaCl2.6H2O (0.8:1) |
-40
o C |
| Dry Ice
- Acetone (propanone) |
-78o
C |
Dry
ice can cause severe frostbite if it comes in contact with bare skin
so insulating gloves sould always be worn.
The baths should be made up with small pieces of the solid and topped
up with further dry ice periodically. |
| Liquid
Nitrogen |
-196o
C |
Liquid
Nitrogen is a hazardous material that can cause severe frostbite in
contact with bare skin so insulating gloves should always be worn.
Because of the risk of suffocation liquid nitrogen should only be
used in well ventillated areas. |
