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A card can stay on a full glass of water because of surface tension. The cohesive forces between water molecules create a thin film on the surface that can support the weight of the card.

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AnswerBot

1y ago

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How does water not spill out when glass covered with card board upside down?

When filling a cup/glass with full water the card/lid will not stay up.


Place a card over the open top of a glass filled to the brim with water and invert it why does the card stay in place?

The card stays in place because of air pressure. When the glass is inverted, the water creates a seal against the card, preventing air from entering. The air pressure pushing up on the card is greater than the force of gravity pulling it down, keeping the card in place.


What makes a card stay up when you turn a glass upside down?

When you place a card on top of a glass and quickly invert it, the air pressure inside the glass is higher than the pressure outside. This pressure difference creates an upward force that holds the card in place until the pressure inside the glass equalizes with the pressure outside.


How many glass of water do you need to take to stay healthy a day?

8 glasses of water.


Why does water flow into the bottom of a glass but ice doesnt?

Ice is less dense than water and therefore floats on water so when the glass has water in it the ice will always stay above the water.


If you are floating in a lake and drinking a glass bottle of beer will it stay colder if held in the air or if held in the water?

It depends were you are, generally it would stay colder if you left it in the water


Why does water from an inverted glass not fall when it is covered with cardboard?

As soon as the card drops a little there is 1) a volume expansion that counteracts the displacement and 2) a thin water rim is formed between the edge of the cup and the card. If the weight of the card is low, a few grams , the surface tension of water is sufficient to prevent air from penetrating the cup. Therefore card is kept in place by the capillary force. With a card of somewhat greater weight the width of the capillary rim increases (but there is additional volume expansion to counteract the weight of the heavier card). Since the capillary force decreases with increasing width of the open edge, the weight range of cards is limited. Eventually it can no longer prevent air from rushing in. But with cards with low weights, thus a thin edge and as a consequence a high capillary force it works fine.


What do you think would happen if the bottom of the glass had a hole in it you submerged it upside down in water?

If the glass has a hole in the bottom and you submerge it upside down in water, the water would enter the glass through the hole until the air pressure inside and outside the glass equalize. Once this happens, the water would stay at a level inside the glass equal to the height of the water outside the glass.


What is the best thing to eat to stay awake?

An Apple, a glass of cold water, or a SMALL cup of coffee or tea.


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Marbles are made out of glass they are not baked as food would be.


Where do glass squids stay in the ocean?

Glass squids stay between the surface and midwater depths of open oceans.


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