Water purity: water free from any admixture or modifying addition
Meniscus: the curved surface of a liquid standing in a tube; the bottom part is where the measurement for volume is read.
Oil-water separation: purifies water through separation of the oils from the water.
Filtration: solid particles are separated from a liquid by passing the mixture through a material that retains the solid particles and allows the liquid to pass through.
Filtrate: the liquid collected after it has been filtered.
Adsorbs: attracts and holds on the surface; charcoal does this well.
Percent recovery: percent of the original foul water that was recovered as purified water.
Histogram: a graph indicating the frequency or number of instances of particular values within a set of related data.
Range: difference between the largest and smallest values in a data set.
Average or mean: all the values added together and divided by the total number of value; the most “typical” or “representative” value for a data set.
Distillation: purifying water through the evaporation of salt.
Electrical conductivity: the ability to transmit an eclectic current.
The Tyndall effect: when a light beam is shot through a glass of distilled water it will not show. If it is beamed through impure water, then it will show.
Water (hydrologic) cycle: The circulation of the earth’s water.
Direct water use: water that can be directly measured.
Indirect water use: hidden uses of water that may never be considered.
Gaseous state: the state of matter having no fixed volume or shape; water vapor.
Liquid state: the state of matter having a fixed volume but no fixed shape; lakes, rivers, oceans, clouds and rain.
Solid state: the state of matter having a fixed volume and shape; snow, ice and frost.
Surface water: originated in a river or other body of water.
Ground water: originates in a well or other underground source.
Aquifer: a water-bearing layer of rock, sand or gravel.
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