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  2. Number density - Wikipedia

    en.wikipedia.org/wiki/Number_density

    Using the number density of an ideal gas at 0 °C and 1 atm as a yardstick: n 0 = 1 amg = 2.686 7774 × 10 25 m −3 is often introduced as a unit of number density, for any substances at any conditions (not necessarily limited to an ideal gas at 0 °C and 1 atm).

  3. Baumé scale - Wikipedia

    en.wikipedia.org/wiki/Baumé_scale

    Near 0 °Bé would be approximately the density of water. −100 °Bé (specific gravity, 0.615) would be among the lightest fluids known, such as liquid butane . Thus, the system could be understood as representing a practical spectrum of the density of liquids between −100 and 100, with values near 0 being the approximate density of water.

  4. Water - Wikipedia

    en.wikipedia.org/wiki/Water

    There are 2.3 billion people who reside in nations with water scarcities, which means that each individual receives less than 1,700 cubic metres (60,000 cu ft) of water annually. 380 billion cubic metres (13 × 10 ^ 12 cu ft) of municipal wastewater are produced globally each year.

  5. Heavy water - Wikipedia

    en.wikipedia.org/wiki/Heavy_water

    Heavy water is less dissociated than light water at given temperature, and the true concentration of D + ions is less than H + ions would be for light water at the same temperature. The same is true of OD − vs. OH − ions. For heavy water Kw D 2 O (25.0 °C) = 1.35 × 10 −15, and [D + ] must equal [OD − ] for neutral water

  6. Water mass - Wikipedia

    en.wikipedia.org/wiki/Water_mass

    However, because water increases its volume by about 9% when frozen, this makes the ice less dense than the water which is why glaciers float. This also in turn causes the salinity of the water to decrease. The salinity of the water makes water freeze at lower temperatures than freshwater.

  7. Does Drinking a Gallon of Water a Day Have Benefits? Here’s ...

    www.aol.com/does-drinking-gallon-water-day...

    Many folks opt to aim for the nice, square number of 1 gallon of water a day (for reference, 2.7 liters equal about 0.7 gallons), so we looked into the health benefits of drinking that much H20 ...

  8. Richardson number - Wikipedia

    en.wikipedia.org/wiki/Richardson_Number

    If it is much greater than unity, buoyancy is dominant (in the sense that there is insufficient kinetic energy to homogenize the fluids). If the Richardson number is of order unity, then the flow is likely to be buoyancy-driven: the energy of the flow derives from the potential energy in the system originally.

  9. Properties of water - Wikipedia

    en.wikipedia.org/wiki/Properties_of_water

    The unusual density curve and lower density of ice than of water is essential for much of the life on earth—if water were most dense at the freezing point, then in winter the cooling at the surface would lead to convective mixing. Once 0 °C are reached, the water body would freeze from the bottom up, and all life in it would be killed. [36]