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Related Concept Videos

Classifying Matter by State02:49

Classifying Matter by State

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Chemistry is the study of matter and the changes it undergoes. Matter is anything that has mass and occupies space. Matter is all around us; the air, water, soil, mountains, even our bodies are all examples of matter. Matter is divided into three states — solid, liquid, and gas — that are commonly found on earth. The fourth state of matter, plasma, occurs naturally in the interiors of stars. 
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Matter: Pure Substances and Mixtures
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures. 
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Respiration01:24

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Overview of the Respiratory System and Energy Production
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The substance of the universe—from a grain of sand to a star—is called matter. Scientists define matter as anything that occupies space and has mass. An object’s mass and its weight are related concepts, but not quite the same. An object’s mass is the amount of matter contained in the object and is the same whether that object is on Earth or in the zero-gravity environment of outer space. An object’s weight, on the other hand, is its mass as affected by the pull of...
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The earliest recorded discussion of the basic structure of matter comes from ancient Greek philosophers. Leucippus and Democritus argued that all matter was composed of small, finite particles that they called atomos, meaning “indivisible.” Later, Aristotle and others came to the conclusion that matter consisted of various combinations of the four “elements” — fire, earth, air, and water — and could be infinitely divided. Interestingly, these philosophers...
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Selecting Appropriate Respirators--A Complicated Matter.

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    Choosing the correct respirator is crucial when respiratory hazards persist and protective equipment is necessary. Proper selection ensures worker safety in hazardous environments.

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    Area of Science:

    • Occupational Health and Safety
    • Respiratory Protection

    Background:

    • Respiratory hazards pose significant risks in various workplaces.
    • Eliminating hazards is the primary goal, but often not feasible.

    Purpose of the Study:

    • To emphasize the critical importance of selecting appropriate respiratory protection.
    • To guide employers in making informed decisions regarding respirators.

    Main Methods:

    • This study focuses on the decision-making process for respirator selection.
    • It highlights the key factors to consider when respiratory hazards cannot be eliminated.

    Main Results:

    • The selection of the correct respirator is paramount for effective hazard control.
    • Improper selection can lead to inadequate protection and increased risk.

    Conclusions:

    • When respiratory hazards are present and cannot be removed, choosing the right respirator is essential.
    • Employers must prioritize correct respirator selection to ensure worker safety.