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  2. Prices of chemical elements - Wikipedia

    en.wikipedia.org/wiki/Prices_of_chemical_elements

    Hydrogen, nitrogen, oxygen and chlorine are cheapest by volume at atmospheric pressure. When there is no public data on the element in its pure form, price of a compound is used, per mass of element contained. This implicitly puts the value of compounds' other constituents, and the cost of extraction of the element, at zero.

  3. Oxygen storage - Wikipedia

    en.wikipedia.org/wiki/Oxygen_storage

    Most humans can function at rest with an oxygen level of 15% at one atmosphere pressure; [1] a fuel such as methane is combustable down to 12% oxygen in nitrogen. A small room of 10 meter 3 has 2.08 meter 3 (2080 liters) or 2.99 kg of oxygen which would occupy 2.62 liters if it was liquid. [2]

  4. Oxygen - Wikipedia

    en.wikipedia.org/wiki/Oxygen

    [13] [50] At 25 °C and 1 standard atmosphere (101.3 kPa) of air, freshwater can dissolve about 6.04 milliliters (mL) of oxygen per liter, and seawater contains about 4.95 mL per liter. [51] At 5 °C the solubility increases to 9.0 mL (50% more than at 25 °C) per liter for freshwater and 7.2 mL (45% more) per liter for sea water.

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  6. Lifting gas - Wikipedia

    en.wikipedia.org/wiki/Lifting_gas

    Only certain lighter than air gases are suitable as lifting gases. Dry air has a density of about 1.29 g/L (gram per liter) at standard conditions for temperature and pressure (STP) and an average molecular mass of 28.97 g/mol, [1] and so lighter-than-air gases have a density lower than this.

  7. 15 Best Jobs for 13-Year-Olds That Pay Well: Your Guide

    www.aol.com/finance/15-best-jobs-13-olds...

    Because full-service drive-through car washes typically cost $5 to $10 per wash, a 13-year-old can charge between $8 and $15 per wash. Babysitting Pay: $12-$18 per hour

  8. Gas exchange - Wikipedia

    en.wikipedia.org/wiki/Gas_exchange

    The dissolved oxygen content in fresh water is approximately 8–10 milliliters per liter compared to that of air which is 210 milliliters per liter. [23] Water is 800 times more dense than air [24] and 100 times more viscous. [23] Therefore, oxygen has a diffusion rate in air 10,000 times greater than in water. [23]

  9. Breathing gas - Wikipedia

    en.wikipedia.org/wiki/Breathing_gas

    A breathing gas is a mixture of gaseous chemical elements and compounds used for respiration. Air is the most common and only natural breathing gas. Other mixtures of gases, or pure oxygen, are also used in breathing equipment and enclosed habitats such as scuba equipment, surface supplied diving equipment, recompression chambers, high-altitude mountaineering, high-flying aircraft, submarines ...

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