# Instant vacuum

Some of you may have wondered about this,many may not have.If we keep a bottle of water at room temperature in the refrigerator and take it out after a few hours,such that the water has not frozen ( even if it has become ice,it gives the same result ),we see a vacuum is created inside the bottle as when we open the cap,we hear a fizz.Understandable.But after the fizz runs out,close the cap tightly and shake the bottle.You will see vacuum is again created inside.Can anybody tell me why does this happen ? Is it created because of the same reason in the first place ?

Note by Kunal Singh
5 years, 1 month ago

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the fizz is not a vacuum... actually when you lower down the temperature of normal water, the solubility of dissolved oxygen decreases and hence it occupies the outer space and aas soon as you open the bottle as the pressure of oxygen inside is somewhat high it runs out in the atmosphere which creates a sound of fizz. This all is due to diffusion of gases dissolved in water and in atmospheric surroundings and their concentrations.

- 5 years, 1 month ago

@Rahul,solubility of gases increases with decrease in temperature & if the pressure was somewhat high inside the bottle,the bottle would not appear 'dented' or 'pichki hui',I should say.

- 5 years, 1 month ago

it is neither vacuum nor oxygen . since freezing of water is exothermic so on decreasing temp. ice is formed and the vapor pressure dec. so when we open a bottle fizz sound is heard

- 5 years, 1 month ago