- Jo allan beran laboratory manual for principles of general.
- Chemistry 101 #0494
- Beran J. A. Laboratory Manual for Principles of General Chemistry.
Bumping is a phenomenon in chemistry where homogenous liquids boiled in a test tube or other container will superheat and, upon nucleation, rapid boiling will expel the liquid from the container. Bumping occurs when liquids are heated or has its pressure reduced very rapidly, typiy in smooth, clean glassware.
Jo allan beran laboratory manual for principles of general.
The hardest part of bubble formation is the formation of the small bubble; once a bubble has formed, it can grow quickly.
Chemistry 101 #0494
Because the liquid is typiy above its boiling point, when the liquid finally starts to boil, a large vapor bubble is formed that pushes the liquid out of the test tube, typiy at hh speed.
Beran J. A. Laboratory Manual for Principles of General Chemistry.
Furthermore, if a liquid is boiled and cooled back down, the chance of bumping increases on each subsequent boil, because each heating cycle progressively de-gasses the liquid, reducing the number of remaining nucleation sites.
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