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you might hear the hissing sound bcuz of the density

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Q: When you first open a sealed can why you hear a hiss?
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How safe are foods ready to eat in can?

If they are within the date on the can and the can is not dented or damaged they should be quite safe. Inspect the can to make sure it has no damage and make sure the top and bottom are flat and not curving out. When you open it there should be a slight hiss as air is sucked into the can. It you hear gas coming out or there is a loud hiss, don't use it.


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Why doesn't the seal on a mayonnaise jar hiss when you open it?

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Over time, hydrogen peroxide (H2O2) decomposes into water (H2O) and pure oxygen (O2) according to the decomposition reaction equation 2H2O2(aq) --> 2H2O(l) + O2(g). The swell in the bottle and the hiss when you open it are the oxygen gas formed.


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There is a clear rubber band that is used as a seal. Drive a not a sharp knife under it parallel to the top cover until you hear a hiss. Once you get a little air out it Accredito,centomigliardi,oggi,


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