Because it sends vibrations through the bottle to make a sound
Over time, the sodium hydroxide will react with the smidges of carbon dioxide in air to produce sodium carbonate, the white, crusty powder that you find around the rim of plastic capped stock bottles (for example). This powder will either prevent the ground glass stopper from sealing properly and exposing the contents to more air, or will in fact cement the ground glass stopper in the bottle, and make it impossible to remove.
Using the equation P1V1/T1 = P2V2/T2 we find there are two variables we might influence in order to change the pressure of a gas. (P=pressure, V=volume, T=temperature in degrees Kelvin) By increasing or decreasing the temperature of the bottle, you can increase or decrease the pressure within. If the bottle is made of a flexible material, like plastic, you can apply pressure to the bottle. By either squeezing the bottle or increasing atmospheric pressure outside, you deform the bottle and decrease it's volume. Since the quantity of gas inside the bottle is constant, the decrease in volume increases the pressure. Likewise to decrease the pressure in a sealed flexible bottle, you can decrease air pressure outside.
When a low pressure system moves in it will try to mix with the system currently in place. If that happens to be a high pressure system you will get thunder storms. If its a low pressure system then nothing changes.
When water freezes, it expands and increases in volume. If the water inside the bottle freezes and expands, but the bottle is not designed to withstand the pressure caused by the expansion, it can burst. The highly corked glass bottle in this scenario could not withstand the pressure from the expanding ice, leading to it bursting.
If you press the stopper down farther, the volume inside the bottle decreases. As a result, the pressure inside the bottle increases because the gas particles inside the bottle are now more compressed due to the reduced volume.
Pressing the stopper down farther would decrease the volume inside the bottle and increase the pressure. This is because the volume and pressure of a gas are inversely related according to Boyle's Law.
The pressure will slightly increase.
With a few exceptions (notably melting ice) objects expand when heated. If you run hot water on a bottle neck, the heat is applied directly to the bottle and only indirectly to the stopper inside the bottle, so the bottle heats first, and thereby expands sooner than the stopper does. An expanded bottle will exert less pressure on the stopper.
to avoid contaminating the chemical when the stopper is replaced
A CORK stopper is a plug for a bottle made of cork
Grease the top of the bottle!
Cork
what happens if you squeeze a bottle with a balloon
The reagent bottle is not used for dropping, having only a common stopper.
The 'operator' fills the bottle with water, then pumps air into it - creating pressure. When the stopper is released, the air pressure forces the water out of the narrow opening in the bottle's neck - creating a stream powerful enough to launch the rocket into the air.
To make a potion bottle, you can start by finding a glass bottle with a cork or stopper. Clean the bottle thoroughly and let it dry. Then, you can decorate the bottle with symbols or labels to make it look like a potion bottle. Fill the bottle with colored liquid or glitter for a magical effect. Finally, seal the bottle with the cork or stopper securely.