What is a bell jar?

A bell jar is a type of glass vessel used in scientific experiments and demonstrations. It has a bell-like shape, with a wide base and a narrow neck that tapers upward. The bell jar is typically used to create a vacuum or to protect objects or samples from outside contamination.

Bell jars are commonly used in chemistry and physics experiments, as well as in the field of biology for creating a controlled environment for experiments. They can also be used in demonstrations to show the effects of air pressure, as the air can be removed from the jar to create a vacuum.

Bell jars are typically made of borosilicate glass, which is durable and able to withstand high temperatures. They are often paired with a vacuum pump or desiccator to create the desired conditions for the experiment.

Overall, bell jars are a versatile and essential tool in scientific research and experimentation.