Water can exist together a heavy (ice), liquid (water) or gas (vapour or gas). Adding heat can cause ice (a solid) to melt to type water (a liquid). Remove heat causes water (a liquid) to frozen to form ice (a solid). Once water changes to a heavy or a gas, us say it alters to a various state of matter. Also though the water’s physical type changes, that is molecules stay the same.

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Water is a molecule

A molecule is a team of 2 or more atoms that bond or ‘stick’ together. Water is a molecule. The is consisted of of two hydrogen (H) atoms and one oxygen (O) atom that are chemically external inspection together. The H and O are symbols for the atom that comprise water. This is why civilization often describe water together H2O. Water can readjust from a liquid to a solid or a gas and ago to a liquid, however its molecules always stay the same. A water molecule is constantly H2O whether it is fluid water, ice or water vapour.


Numerous everyday words, favor energy, have a different an interpretation in science. We talk around running out of energy during a race or kids having too lot energy. Scientists specify energy together the potential to do work – such together heating or cooling water to make it change state.


Changing says of matter and energy

Water, favor all other species of matter, requires the enhancement or remove of power to change states. A block of ice is heavy water. When warm (a form of energy) is added, the ice cream melts into liquid water. It has reached the melting suggest – 0°C. Continue to use heat, and the water will certainly turn right into water vapour, i beg your pardon is water in its gaseous state. The water has actually reached that is boiling suggest – 100°C.


If warmth is gotten rid of from water vapour, the gas cools down and it condenses earlier into fluid water. Proceed to cool the water (by removed heat), and also it i do not care solid ice. This is its freeze point.

Water can adjust state over and also over again

You may have heard that the water girlfriend drink this day is the exact same water the dinosaurs drank thousands of years ago. Nature recycles water. It can be melted, frozen and also evaporated again and again. Over there is no ns of water throughout or after ~ it alters form. Frozen water (ice) take away up more space than liquid water because it is less dense, yet when the ice melts, it is the very same amount of water as prior to although few of it might be in the form of water vapour.


Changes that state go past melting and also freezing. Ice can turn straight to a gas, and gas can adjust state come plasma or Bose-Einstein condensate. Read about the says of matter.

The write-up Solids, liquids and gases – provides water together the context to explain states the matter.

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Activity ideas

Explore claims of matter with these activities:


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