By stuffing in many particles inside. It can be water particles, marbles or even air particles. As long as the jar is not vacuum, you can technically say that you have 'pressure in a jar'. However, The usefulness of such statement is questionable as well as the person's understanding of physics.
If the jar was not thick enough to resist the exterior pressure, it would implode, just as a pressurized jar in space would explode.
Increase the pressure of the gas inside
a water jar is a woven basket used to collect water
The balloon exists in a separate pressure system from the bell jar itself.As the balloon is open to the surrounding air, the pressure within the balloon is 1 atm (1 atmospheric unit of pressure = 105 Pa).When pressure is decreased within the jar, the pressure within the jar decreases to a value lower than 1 atm. Therefore, to counter the low pressure created in the jar, the atmospheric air moves into the balloon and pushes the balloon into the jar to attempt to equalize the pressure in the balloon and in the jar. Therefore the balloon inflates.
Increase the pressure of the gas inside
Yes you can pressure cook a pint jar in a pressure cooker.
This depends on the volume and pressure of gas.
The air pressure inside a jar is related to the number of air molecules present. When there are more air molecules in the jar, the pressure increases due to more collisions with the walls of the jar. Conversely, fewer air molecules result in lower pressure.
Jam contains a high proportion of water, so it would depend on the physical strength of the jar. I'm assuming that this is a glass jar? Most likely, the jar would crack or shatter as the pressure around it was decreased, allowing the water in the jam to boil off into the vacuum.
Gas jar
They do not.
The pickle jar didn't pop when it was opened because the pressure inside the jar was equalized with the pressure outside, preventing the popping sound.