What is Blackbody Radiation?

What is meant by the phrase “black body” radiation? The point is that the radiation from a heated body depends to some extent on the body being heated. To see this most easily, let’s back up momentarily and consider how

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Some info about S.I. units

For many years scientists recorded measurements in metric units, which are related decimally, that is, by powers of 10. In 1960, however, the General Conference of Weights and Measures, the international authority on units, proposed a revised metric system called the International System

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Extensive properties and intensive properties

All measurable properties of matter fall into two categories: extensive properties and intensive properties. The measured value of an extensive property depends on how much matter is being considered. Mass, length, and Volume are extensive properties. More matter means more mass. Values

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Some examples of chemical properties

“Hydrogen gas burns in oxygen gas to form water” describes a chemical property of hydrogen because to observe this property we must carry out a chemical change, in this case burning. After the change, the original substances, hydrogen and oxygen gas, will have

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Physical properties of a substance.

  Physical property can be measured and observed without changing the composition or identity of a substance. Substances are identified by their properties as well as by their physical properties. Such as composition. Color, melting point, boiling point, and density are For

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The definition of “Compound”.

  Most elements can interact with one or more other elements to form compounds. We define a compound as a substance composed of two or more elements chemically united in fixed proportions. Hydrogen gas, for example, burns in oxygen gas

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The definition of “Element”.

An element is a substance that is not possible to separate into simpler substances by chemical means. Till now, 114 elements have been identified. Chemists use alphabetical symbols to represent the names of the elements. The the first letter of the

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The Definition of “Mixture”

A mixture is a combination of two or more substances in which the substances retain their distinct identities. Some examples are air, soft drinks, milk, and cement. Mixtures do not have a constant composition. Samples of air collected in different cities would

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The definition of “Substance”

A substance is a matter that has a definite or constant composition and distinct properties. Examples are water, silver, ethanol, table salt (sodium chloride), and carbon dioxide. Substances differ from one another in composition and can be identified by their appearance, smell,

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