What do a grain of sand, a big rock, a seed, a big air plain, the air, the huge mountain and people have in common? We all belong the a group called matter.
Matter is all around us. It exists in different states or form. Can you name their different states?
To demonstrate the different states of matter, let us take a look of the water. Water is a common example of matter. A big block of ice is water in solid state. A boy drinking on a faucet is drinking the water in its liquid form. And have you notice the steam coming out of a boiling water in a kettle? That steam is water in its gas form. Therefore, the most common states of mater are called solid, liquid and gas. And in this example, water can be in a form of a solid, liquid and gas. But what causes the water to change its form?
In every day life, we see water in its liquid form. If the water is put into a freezer, it turns to solid. This is because the temperature in the freezer is very low so water freezes or changes into ice or solid. If you place the ice in your palm, in a short while, it change into liquid. This is because the heat from you hands makes the ice melt and turn into its liquid state. If you put water in a kettle and heat it up to its boiling temperature of about 100°C, you will see that the water will turn into gas. The water vapor at boiling temperature is called steam.
There are other kinds of matter that changes its state. This will depend on the kind of temperature you subject it to. An ice melts about 0°C a piece of metal will melt at a very high temperature.
note: originally posted at Bukisa.com under the same author.
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