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Why is there a safety valve in the Campus beaker? (For beakers made before 2018.)
Why is there a safety valve in the Campus beaker? (For beakers made before 2018.)

Storing fruit juices in a closed container for a long time can cause them to ferment. This can create a build-up of pressure inside the beaker. The pressure safety valve stops the pressure becoming too high and causing the beaker to explode. When the pressure inside the beaker becomes too high, the safety valve pops open. This then causes the beaker to leak. After you have cleaned the beaker's components, you can easily reassemble it. By the way, the beaker can be safely used with fizzy drinks too. The pressure created by the carbon dioxide in the beaker is not enough to open the safety valve.