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Q: When checking the refrigeration unit what does the absence of bubbles in the sight glass indicate?
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Is a beef stew spoiled of it has bubbles after refrigeration the next day?

Try stirring it. If the bubbles keep popping up and make a sloshing sound, it has gone bad. stay away.


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Bubbles represent a cool, happy, bubbly personality. It represents being comfortable with your self and being very comfortable in your personality


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Take yeast making alcohol for an example. They take sugar (notice the absence of O2) and make alcohol and CO2. This is why beer and wine have bubbles. Yeast CO2 bubbles can also be found in bread!


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Do bubbles indicate a physical or chemical change?

Not always but they can. They may simply be an indication of a phase change, as when water boils. This is usually counted as a physical change rather than a chemical change. But if you add baking soda to vinegar, you will see bubbles as a result of a chemical change.


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No. That is a physical change of the liquid water turning to gas (steam)


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