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Marshmallows are mostly air puffed sweetened Gelatin. When the air pressure outside of the mallow goes down, the air inside begins to expand. The further out of equilibrium it goes, the larger the mallow will expand until all of the air inside has escaped.

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Why do marshmallows expand in the microwave?

Marshmallows expand in the microwave because the heat causes the air bubbles trapped inside them to expand, making the marshmallows puff up and increase in size.


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Vacuum storage bags work by shrinking the size of whatever you put in them. They are extremely efficient.


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How do i measure dry mini marshmallows into 8 ounces?

Get a set of digital kitchen scales and put the marshmallows on one by one until you have 8oz


How does air get into a marshmallow to make it bigger?

Air does not necessarily go into marshmallows to make them expand. In fact, marshmallows are already full of air in tiny bubbles. There are two mechanisms that cause marshmallows to expand, both resulting from an imbalance in the pressure inside these bubbles compared to that of the atmosphere. The first way would be if the marshmallow is placed inside a vacuum, or any other low pressure environment. Because there is a fixed amount of air in the bubbles (from when the marshmallows were made), when the external pressure pushing against the outside of the marshmallow decreases, the air inside the marshmallow will expand so that its pressure is equal to that of its atmosphere. The other mechanism is perhaps more familiar, and that is in a microwave. What happens is that when the microwave heats the water in the marshmallow, it warms the air and the sugary goo around it. This causes the air to expand. This is like what happens when you bring balloons into a heated building during winter- the heat causes the air molecules to move faster, and bump into the sides of the container with more force, therefore pushing outward. Again the pressures inside and outside must equal each other, so the bubbles in the marshmallow expand. Furthermore, when the sugar is heated, it becomes more pliable, which allows the air to expand more easily.


How does an egg suck into a bottle when you put 3 matches in it?

The matches burn up the oxygen, removing it. This causes a vacuum, which pulls the egg in. Also the heat from the matches expand the air in the bottle. Once they have gone out, the air cools and contracts, causing a vacuum and pulling the egg in.


250g of mini marshmallows is how many cups?

The conversion from grams to cups for mini marshmallows can vary slightly depending on the density of the marshmallows and how tightly packed they are. However, as a general estimate, 250g of mini marshmallows is approximately equivalent to about 2 cups. It's always best to use a kitchen scale for precise measurements when baking or cooking with ingredients like marshmallows that can vary in density.


Can gases stretch out to fill a vacuum?

Yes. A gas will expand to fill a space evenly.