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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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The characteristics that enable us to distinguish one substance from another are called properties.
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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

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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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What is Matter?01:13

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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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Updated: Jan 23, 2026

Inducing Polyp Bail-out in Coral Colonies to Obtain Individualized Micropropagates for Laboratory Experimental Use
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Polyp detection rate: does length matter?

Jonathan P Segal1,2, Cynthia Kanagasundaram3, Philip Mills3

  • 1Department of Gastroenterology, St Mark's Hospital, Harrow, UK.

Frontline Gastroenterology
|June 18, 2019
PubMed
Summary
This summary is machine-generated.

Closer monitor distance improves polyp detection rates during colonoscopies, especially for bowel cancer screening. This finding highlights the impact of endoscopy room setup on colonoscopy quality and polyp identification.

Keywords:
adenomaendoscopypolyp

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Area of Science:

  • Gastroenterology
  • Endoscopy
  • Cancer Screening

Background:

  • Polyp detection rate serves as a key indicator for adenoma detection rate and overall colonoscopy quality.
  • This study is the first to investigate the impact of endoscopist-to-monitor distance on polyp detection rates.

Purpose of the Study:

  • To evaluate the effect of varying endoscopist-to-monitor distances on polyp detection rates in colonoscopy.
  • To determine if monitor placement influences the quality of colonoscopic examinations.

Main Methods:

  • A retrospective study comparing polyp detection rates across different endoscopy room configurations.
  • Colonoscopies performed between December 2013 and November 2014 were analyzed.
  • Room setups varied in endoscopist-to-monitor distance: Room A (219 cm), Room B (147 cm), and control rooms C/D (190 cm).

Main Results:

  • A statistically significant higher polyp detection rate was observed in the room with the closest monitor distance (147 cm) compared to the furthest (219 cm) for bowel cancer screening lists (p<0.0006).
  • A trend towards higher polyp detection was noted with closer monitor distance (147 cm) versus the 190 cm distance (p=0.08).
  • This effect was not significant for general service lists.

Conclusions:

  • Endoscopist-to-monitor distance can influence polyp detection rates during colonoscopy.
  • For bowel cancer screening, a closer monitor distance appears to correlate with higher polyp detection rates, suggesting an optimization opportunity for endoscopy suites.