Surface tension is the property of a liquid that allows it to obtain the smallest surface area possible.
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Water is a very stable compound of hydrogen and oxygen, vital for all known forms of life. In nature it occurs in liquid, solid and gaseous state.
A phase transition is the change of a substance from one state of matter to another.
Candles have been used for lighting since ancient times.
These organs are vital for the survival and development of plants.
This animation demonstrates the structure and operation of hair dryers.
Plants are capable of converting inorganic substances (carbon dioxide and water) into organic sugar.
This animation explains transparency and opacity, the principle of radiography, and the light-absorbing properties of materials.