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- Evacuate chamber with vacuum pump and water boils.
- Explanation: Room temperature water contains enough energy to boil but won’t because atmospheric pressure pushes in on the liquid from all sides, preventing vapor bubbles from forming.Remove pressure and water will boil.
- Demo located in L02, section C-3.
- Demonstrate Boiling at a Reduced Temperature and Pressure.
Initially, the flask should be in a normal upright position and partially
filled with water. After bringing the water to a boil, close off the neck
with a rubber stopper fitted with a thermometer and invert the flask. Place
ice in the concave bottom. Water should start to boil again, and continue
to boil until it is only 15° or 20° above room temperature.
- Located in L02, section C3.