Tag Archives: Gas

Why do onions make my eyes water?

Onions contain a mildly stimulating oil.  This oil readily forms a vapor (gas) which escapes when the onion is cut.  It not only gives the onion its sharp odor, but also irritates the eye.  The eye reacts by producing a flow of tears to wash away the pungent stuff the onion gives off. When you …

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How does yeast make bread rise?

YEASTS ARE THE TINY PLANTS THAT, WHN MIXED IN MOIST BREAD DOUGH, RELEASE A GAS THAT PUFFS UP THE DOUGH AND MAKE THE BREAD SOFT AND LIGHT. Bread is the oldest of all manmade foods. The earliest bread was not like the bread you are probably used to.  It was hard, flat, and dry. The …

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What makes the holes in swiss cheese?

Swiss cheese is a cheese with many large holes.  The holes are made by bacteria. To make Swiss cheese, the cheese maker begins by adding special bacteria to fresh milk. This is not the kind of bacteria that makes you sick.  These are safe bacteria. These cause the milk to sour, and this is known …

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How does a blimp stay in the air?

A blimp is an airtight bag that is able to rise in the air because it is filled with light gases.  A blimp is a small, balloon-like airship.  Unlike the heavier-than-air airplane, the blimp remains aloft because it is lighter than air.  It needs only small motors to push it forward.  Blimps are descendants of …

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