Evaporation and Melting

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Why does ice turn into water? Why does boiling water disappear? Check out this page on evaporation and melting. Also check out our other pages on matter and energy.

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Matter

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Changing its temperature can change matter from one form to another form. If you freeze water, which is in a liquid state, it changes into a solid state (ice). If you boil the liquid, you see the liquid escaping in the form of bubbles and changing into a gaseous state. These states of matter are only the physical properties. There is no change in its chemical composition. Ice and water vapor continue to be water in different forms or states.

Sometimes a liquid can be sitting there and its molecules will become a gas. That is called Evaporation. You might be wondering how that can happen when the temperature is low. It turns out that all liquids can evaporate at room temperature and pressure. Evaporation takes place when there are atoms or molecules escaping from the liquid and turning into a vapor.

Water is a good example for evaporation and melting. Water is transferred from the surface to the atmosphere through evaporation; the process by which water changes from a liquid to a gas. Evaporation is the process whereby atoms or molecules in a liquid state (or solid state if the substance sublimes) gain sufficient energy to enter the gaseous state.

Evaporation

Water in the liquid state changes to water in a gaseous state. Water evaporates to turn into water vapor. Water can evaporate or disappear with the help of heat. Changes in temperature can increase or decrease the rate of evaporation. Evaporate means to disappear. Water can evaporate from soil. It evaporates off wet clothes hanging on a clothesline. Plants release water vapor into the air. We breathe out water vapor along with carbon dioxide.

Melting : When you drop an ice cube into any liquid, it begins to melt because the temperature of the liquid is higher than that of the ice cube. It is like putting a snowman on your front lawn in July. You need some energy to melt ice cube into a liquid.

Melting

Atoms in a liquid have more energy than the atoms in a solid. The easiest energy available around is probably heat. Every substance has a certain temperature at which it melts. It is called as its melting point. When a solid reaches the temperature of its melting point, it changes to a liquid. For water the temperature has to be a little over zero degrees Celsius. For salt, sugar, or wood, the melting point would be higher than water.

 

Books about Mixing Substances

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Links to other sites about Mixing Substances

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Different States of Water http://www.nyu.edu/pages/mathmol/textbook/slg.html
States of Matter http://chem4kids.com/files/matter_states.html
Balloon Blow Up http://www.exploratorium.edu/science_explorer/
balloon_blowup.html
Changing States of Matter http://chem4kids.com/files/matter_changes.html
 

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