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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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Classifying Matter by Composition03:35

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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. 
A pure substance is a form of matter that has a constant composition throughout with uniform properties. For example, any sample of sucrose has the same composition and same physical properties, such as melting point, color, and sweetness, regardless of the source from which it is isolated. 
A mixture is composed of two or...
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Physical and Chemical Properties of Matter02:57

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The characteristics that enable us to distinguish one substance from another are called properties.
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What is Matter?01:13

What is Matter?

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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 Atomic Theory of Matter02:59

The Atomic Theory of Matter

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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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States of Matter01:20

States of Matter

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Solids, liquids, and gases are the three states of matter commonly found on Earth. A solid is rigid and possesses a definite shape. A liquid flows and takes the shape of its container, except it forms a flat or slightly curved upper surface when acted upon by gravity. Both liquid and solid samples have volumes nearly independent of pressure. A gas takes both the shape and volume of its container.
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Related Experiment Video

Updated: Feb 15, 2026

Impact of High-intensity Interval Exercise and Moderate-Intensity Continuous Exercise on the Cardiac Troponin T Level at an Early Stage of Training
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Editorial: Exercise for NAFLD: does intensity matter?

Hari S Conjeevaram, Dina G Tiniakos

    The American Journal of Gastroenterology
    |March 8, 2011
    PubMed
    Summary

    Vigorous exercise, not moderate activity, is linked to reduced odds of non-alcoholic steatohepatitis (NASH) and advanced liver fibrosis. Optimal exercise intensity for NASH management requires further research.

    Area of Science:

    • Hepatology
    • Gastroenterology
    • Exercise Physiology

    Background:

    • Nonalcoholic fatty liver disease (NAFLD) and non-alcoholic steatohepatitis (NASH) lack specific treatments, with insulin resistance (IR) and lipotoxicity central to pathogenesis.
    • Lifestyle interventions like diet, weight loss, and physical activity are primary management strategies for NASH patients.
    • Physical activity shows potential to improve IR, support weight loss, and enhance liver histology in NASH.

    Discussion:

    • Current exercise guidelines lack specificity regarding intensity, duration, and volume for NASH patients.
    • Kistler et al. found vigorous exercise, independent of duration or volume, associated with lower odds of NASH or advanced fibrosis.
    • Moderate exercise intensity did not show a significant association with improved NASH or fibrosis outcomes.

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    Related Experiment Videos

    Last Updated: Feb 15, 2026

    Impact of High-intensity Interval Exercise and Moderate-Intensity Continuous Exercise on the Cardiac Troponin T Level at an Early Stage of Training
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    Supramaximal Intensity Hypoxic Exercise and Vascular Function Assessment in Mice
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    Evaluation of Blood Lactate and Plasma Insulin During High-intensity Exercise by Antecubital Vein Catheterization

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    Key Insights:

    • Vigorous physical activity may be more effective than moderate activity in reducing the likelihood of NASH and advanced liver fibrosis.
    • Exercise intensity appears to be a critical factor, potentially more so than the total volume or duration of activity.
    • The findings suggest a potential role for high-intensity exercise in the non-alcoholic fatty liver disease (NAFLD) spectrum.

    Outlook:

    • Further prospective studies are needed to confirm the role of exercise intensity in NAFLD histology.
    • Research should utilize objective physical activity measures and consider the impact of concurrent weight loss.
    • Investigating the effects of specific exercise regimens on individual histological features of NAFLD is crucial for clinical application.