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  2. This Common Water Problem Might Be Making Your Home Dirtier - AOL

    www.aol.com/common-water-problem-might-making...

    Water hardness is measured by the milligrams of calcium carbonate per liter of water(mg/L). Soft water: 0-60 mg/L. Moderately hard water: 61-120 mg/L. Hard water: 121-180 mg/L. Very hard water ...

  3. Density - Wikipedia

    en.wikipedia.org/wiki/Density

    As there are many units of mass and volume covering many different magnitudes there are a large number of units for mass density in use. The SI unit of kilogram per cubic metre (kg/m 3) and the cgs unit of gram per cubic centimetre (g/cm 3) are probably the most commonly used units for density. One g/cm 3 is equal to 1000 kg/m 3. One cubic ...

  4. Surface tension - Wikipedia

    en.wikipedia.org/wiki/Surface_tension

    Surface tension is the tendency of liquid surfaces at rest to shrink into the minimum surface area possible. Surface tension is what allows objects with a higher density than water such as razor blades and insects (e.g. water striders) to float on a water surface without becoming even partly submerged.

  5. Seawater - Wikipedia

    en.wikipedia.org/wiki/Seawater

    The most abundant dissolved ions in seawater are sodium, chloride, magnesium, sulfate and calcium. [16] Its osmolarity is about 1000 mOsm/L. [17] Small amounts of other substances are found, including amino acids at concentrations of up to 2 micrograms of nitrogen atoms per liter, [18] which are thought to have played a key role in the origin ...

  6. Instant tea - Wikipedia

    en.wikipedia.org/wiki/Instant_tea

    Instant tea powder by itself is the dehydrated flavor, aroma, and color compounds found in tea. When marketed, other ingredients can be added, such as sugar for taste, citric acid for tartness, [2] and other flavors that would not normally be found in tea leaves, such as those of raspberry or lemon.

  7. Space toilet - Wikipedia

    en.wikipedia.org/wiki/Space_toilet

    There are four basic parts in a space toilet: the liquid-waste vacuum tube, the vacuum chamber, the waste storage drawers, and the solid-waste collection bags. The liquid-waste vacuum tube is a 2-to-3-foot (61 to 91 cm) long rubber or plastic hose that is attached to the vacuum chamber and connected to a fan that provides suction.

  8. List of Latin words with English derivatives - Wikipedia

    en.wikipedia.org/wiki/List_of_Latin_words_with...

    This is a list of Latin words with derivatives in English language.. Ancient orthography did not distinguish between i and j or between u and v. [1] Many modern works distinguish u from v but not i from j.

  9. Prussian blue - Wikipedia

    en.wikipedia.org/wiki/Antwerp_blue

    Prussian blue (also known as Berlin blue, Brandenburg blue, Parisian and Paris blue) is a dark blue pigment produced by oxidation of ferrous ferrocyanide salts. It has the chemical formula Fe 3+ 4 [Fe 2+ 6] 3.