parts per million
Unit expressing the part of a whole number in units of 1/1000000. Abbreviated to ppm.
Results for “parts per million”
Ichthyological terms, not general ones.
dissolved oxygen
The concentration of oxygen dissolved in a water body. Normally expressed in milligrams per liter, parts per million, or percentage saturation.
Used in 296 profiles
carbonate hardness
Measure of the alkalinity of water as dictated by the presence of bicarbonate and carbonate ions. Usually expressed as parts per million, milligrams per litre, or degrees (dKH) of which 1 dKH corresponds to 17.848 ppm. Sometimes used a synonym for, but not equivalent to, temporary hardness.
Used in 65 profiles
total dissolved solids
Measure of the total concentration of both organic and inorganic, microscopic particles suspended in a given liquid. Usually applied only to freshwater systems and measured using a conductivity or total dissolved solids meter with results expressed in units of mg per unit volume of water (e.g., mg/L) or parts per million (ppm). Soft water with low pH generally has low levels of total dissolved solids whereas harder water with higher pH tends to contain correspondingly increased concentrations. Often abbreviated to TDS.
Used in 2 profiles