- degree of hardness of water
- 水硬度
English-Chinese lightIndusrty dictionary (英汉轻工业大词典). 2013.
degree of hardness of water
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Degree — may refer to: Contents 1 As a unit of measurement 2 In mathematics 3 In education … Wikipedia
degree — 1. (° or deg) the standard unit of angle measure, equal to 1/360 circle, 60 minutes, 3600 seconds, or about 0.017 453 293 radian. So far as we know, this unit was introduced by the Greek geometer Hipparchus of Nicaea (ca. 180 ca. 125 BC),… … Dictionary of units of measurement
hardness — water with a high mineral content, the name deriving from the fact that it is hard to develop a lather for cleaning. The concentration of calcium and magnesium ions in water is expressed as p.p.m. or mg/l of calcium carbonate equivalents. Soft… … Dictionary of ichthyology
Water purification — This article is about large scale, municipal water purification. For portable/emergency water purification, see portable water purification. For industrial water purification, see deionized water. For distilled water, see distilled water. Water… … Wikipedia
water hardness — the concentration of calcium and magnesium ions in water expressed as p.p.m. or mg/l of calcium carbonate equivalents. Water hardness expressed in degrees of hardness. 0 4 is very soft, 5 8 soft, up to 30 which is extremely hard water. Note that… … Dictionary of ichthyology
Water softening — A water softener reduces the dissolved calcium, magnesium, and to some degree manganese and ferrous iron ion concentration in hard water.These hardness ions cause three major kinds of undesired effects. Most visibly, metal ions react with soaps… … Wikipedia
Degree symbol — This article describes the typographical or mathematical symbol. For other meanings, see Degree. ° Degree symbol Punctuation … Wikipedia
hardness — /hahrd nis/, n. 1. the state or quality of being hard: the hardness of ice. 2. a relative degree or extent of this quality: wood of a desirable hardness. 3. that quality in water that is imparted by the presence of dissolved salts, esp. calcium… … Universalium
hardness — 1. The degree of firmness of a solid, as determined by its resistance to deformation, scratching, or abrasion. SEE ALSO: h. scale, number. 2. The relative penetrating power of a beam of x rays, used both within the diagnostic range of … Medical dictionary
degree — 1) 1/360 of a circle or 60 minutes. The symbol here and below is ° 2) 60 nautical miles, 69.05 statute miles or 111.12 km 3) a temperature unit (Celsius or Fahrenheit). Strictly 10°C is an actual temperature while 10C° is a range (from say 23 to… … Dictionary of ichthyology
Hard water — is the type of water that has high mineral content (in contrast with soft water ). Hard water minerals primarily consist of calcium (Ca2+), and magnesium (Mg2+) metal cations, and sometimes other dissolved compounds such as bicarbonates and… … Wikipedia
