U.S. flag

An official website of the United States government

Format

Send to:

Choose Destination
  • Sorry, I couldn't understand your request.

Supplemental Content

Recent activity

  • Krypton
    Krypton
    A noble gas that is found in the atmosphere. It has the atomic symbol Kr, atomic number 36, atomic weight 83.80, and has been used in electric bulbs.<br/>
    MeSH
  • Motion Pictures
    Motion Pictures
    The art, technique, or business of producing motion pictures for entertainment, propaganda, or instruction.<br/>Year introduced: 2018(1963)
    MeSH
  • Carbon Dioxide
    Carbon Dioxide
    A colorless, odorless gas that can be formed by the body and is necessary for the respiration cycle of plants and animals.<br/>
    MeSH
  • Hypocapnia
    Hypocapnia
    Clinical manifestation consisting of a deficiency of carbon dioxide in arterial blood.<br/>Year introduced: 1992
    MeSH

Your browsing activity is empty.

Activity recording is turned off.

Turn recording back on

See more...