relative water content
1Water content — Soil composition by phase: s soil (dry), v void (pores filled with water or air), w water, a air. V is volume, M is mass. Water content or moisture content is the quantity of water contained in a material, such as soil (called soil moisture),… …
2Water activity — or aw is a measurement of the energy status of the water in a system. It is defined as the vapor pressure of water above a sample divided by that of pure water at the same temperature; therefore, pure distilled water has a water activity of… …
3Relative humidity — is a measurement of the amount of water vapor that exists in a gaseous mixture of air and water. Estimating relative humidity The relative humidity of an air water vapor mixture can be estimated if both the temperature ( T ) and the dew point… …
4Water resources — A natural wetland Water resources are sources of water that are useful or potentially useful. Uses of water include agricultural, industrial …
5Relative density — Relative density, sometimes called specific density, is the ratio of the density of a substance to the density of a given reference material. If a substance s relative density is less than one then it is less dense than the reference; if greater… …
6Water supply — is the process of self provision or provision by third parties of water of various qualities to different users. Irrigation is covered separately. Global access to waterIn 2004 about 3.5 billion people worldwide (54% of the global population) had …
7Water intoxication — Classification and external resources Water intoxication, also known as water poisoning, is a potentially fatal disturbance in brain functions that results when the normal balance of electrolytes in the body is pushed outside of safe limits by… …
8relative humidity — Humidity Hu*mid i*ty, n. [Cf. F. humidit[ e].] 1. Moisture; dampness; a moderate degree of wetness, which is perceptible to the eye or touch; used especially of the atmosphere, or of anything which has absorbed moisture from the atmosphere, as… …
9relative humidity — Humidity Hu*mid i*ty, n. [Cf. F. humidit[ e].] 1. Moisture; dampness; a moderate degree of wetness, which is perceptible to the eye or touch; used especially of the atmosphere, or of anything which has absorbed moisture from the atmosphere, as… …
10Water supply and sanitation in South Africa — After the end of Apartheid South Africa s newly elected government inherited huge services backlogs with respect to access to water supply and sanitation. About 15 million people were without safe water supply and over 20 million without adequate …
