Why would water droplets form on the outside of a glass cup?


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2010-06-01 14:47:02
2010-06-01 14:47:02

What your seeing is known as condensation. The water droplets on the glass are "dew"- the surface of the glass in cooling much quicker than the temperature of the air around the glass.

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If the glass and its contents were cold, moisture in the warmer atmosphere would condense on the glass and and form droplets.

The effect is called Condensation You can look this up easily.

Water droplets will be formed only in that case in which the water is chilled or cold. This is due to condensation of water vapors present in the atmosphere...... As soon as they strike the cold glass, their temperature decreases, due to which there is a change in the state of matter from gas to liquid.....

its called condensation and its caused from cold and warm air hitting each other.

Assuming the glass cup held a cold liquid, the air closest to the cup will be colder than the surrounding air, causing water vapour in the air to condense into liquid water droplets.

The formation of water droplets on a cold glass are a physical change because it's nothing more than condensation. The water that is in the air is a gas, and it has undergone a change of state to become a liquid (the droplets). If the water and the glass fused and made another element that could not be made back into either of its two original forms, then it would be a chemical change.

When I grew up in Fairbanks, Alaska, we would go outside when it was below -60 degrees Fahrenheit, and toss a glass of hot water into the air. If cold enough, the water droplets would crystallize in the air before hitting the snow. If not quite cold enough, water would hit the ground, and freeze in seconds.

Water would condense on those items. This is what is happening when you have a glass of ice water, and water collects on the outside of the glass.

There is always water in the air in its gaseous form. When air is warmer it can hold more water before the water begins to condense and form into droplets. That's why you hear about relative humidity in the weather report - if the relative humidity is 50% it means that there is about half the maximum amount of water in the air that it can hold at its current temperature. So the bottom line is, when air cools it can hold less water. Your glass of iced tea cools the air around it, the air can no longer hold all of the water that is in it and the water condenses onto the surface of the glass. You would find that there would be more condensation in more humid weather.

If ice forms on the outside of the glass cup the temperature of the glass would be 25 degrees Fahrenheit. This is due to the fact that water freezes at 32 degrees Fahrenheit.

No. The glass of the beaker, since it is hot, not cold, would not cause the ambient moisture to coalesce on the glass

If the glass of ice water remains in the kitchen then yes, the warm humid air of the kitchen will condense water on the side of the cold glass of ice water. If you take the glass outside then no. 25'F is below the freezing point of water so the air will be colder than the glass of ice water which can be no colder than 35'F. Besides this there will be no water in the air as it will have been frozen-out by the cold temperature, so there will be nothing to condense.

Dry water is a powdered liquid. It is a water air emulsion that has tiny water droplets. The water droplets are the size of a grain of sand. ==================================================== I am not sure of the veracity of the above answer, the water droplets would still each be wet!! However, in its solid form, ice, water is no longer wet.

The hot heat from the hot water turns evaporates. Once it reaches or touches a cool surface (mirror), the heat would condense and turn into water droplets. Therefore, water droplets are found in the mirror when you bath.

The latent heat of evaporation - (if you wet your finger and then blow on it it feels cool this is because the evaporating water takes heat out of your finger). This heat is recovered when the liquid re-condenses - (water droplets forming on the outside of a cold glass of beer heat the glass with this recovered energy and the beer in the glass warms up far more quickly than it would if the air was dry).

"I froze some popsicles"? When I errantly left a glass of water outside overnight during winter, the glass was broken when the water in it froze solid.

The glass would break and you would have a mess

no because it is impossible,that glass would dissolve in the water according to the scientist glass decomposed million of years so to that its only shows that glass would never dissolve in water.

As the ice in the bottle is colder than the surrounding air, thus air would be trapped onto the bottle due to exposed surface area.

A glass of water would be.. un verre d'eau.

The heat from your body warms the water droplets. The fan cools the droplets - making you colder.

Water evaporate faster in a wide glass than in a narrower glass.

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