Volumetric water content, θ, is defined mathematically as: θV w V wet }{V_{\text{wet}}}}} where V w } is the volume of water and V wetV s + V w + V a }=V_{s}+V_{w}+V_{a}} is equal to the total volume of the wet material, i.e. of the sum of the volume of solid host material (e.g., soil particles, vegetation tissue) V s } , of water V w } , and of air V a } .
Kadar air volumetrik, θ, didefinisikan dengan: θV w V T }{V_{T}}}} di mana V w } adalah volume air dan V TV s + V vV s + V w + V aV_{s}+V_{v}=V_{s}+V_{w}+V_{a}} yaitu total volume yang mencakup volume tanah, volume air, dan volume udara.
Gravimetric water content is expressed by mass (weight) as follows: um w m s }{m_{s}}}} where m w } is the mass of water and m s } is the mass of the solids.
Kadar air gravimetrik diekspresikan dengan massa: um w m t }{m_{t}}}} di mana m w } adalah massa air dan m t } adalah massa curah.
In soil mechanics and petroleum engineering the water saturation or degree of saturation, S w } , is defined as S wV w V vV w V ϕθ ϕ{\frac {V_{w}}{V_{v}}}={\frac {V_{w}}{V\phi }}={\frac {\theta }{\phi }}} where ϕV v / V /V} is the porosity, in terms of the volume of void or pore space V v } and the total volume of the substance V .
Dalam mekanika tanah dan teknik perminyakan, istilah kejenuhan air atau derajat kejenuhan, simbol S w } digunakan, dan didefinisikan sebagai: S wV w V vV w V T ϕθ ϕ{\frac {V_{w}}{V_{v}}}={\frac {V_{w}}{V_{T}\phi }}={\frac {\theta }{\phi }}} di mana ϕV v / V T /V_{T}} adalah porositas dan V v } adalah volume ruang kosong atau pori.
Values of Sw can range from 0 (dry) to 1 (saturated).
Nilai dari Sw dapat bervariasi dari 0 (sangat kering) hingga 1 (jenuh air).
The normalized water content, Θ , (also called effective saturation or S e } ) is a dimensionless value defined by van Genuchten as: Θθ − θ r θ s − θ r }{\theta _{s}-\theta _{r}}}} where θ is the volumetric water content; θ r } is the residual water content, defined as the water content for which the gradient d θ / d h becomes zero; and, θ s } is the saturated water content, which is equivalent to porosity, ϕ .
adalah nilai tak berdimensi yang didefinisikan oleh van Genuchten sebagai: Θθ − θ r θ s − θ r }{\theta _{s}-\theta _{r}}}} di mana θ adalah kadar air volumetrik; θ r } adalah kadar air sisa, yaitu kadar air ketika gradien d θ / d h menjadi nol; dan, θ s } adalah kadar air jenuh, yang ekuivalen dengan porositas, ϕ .
Humidity, "water content" in air Moisture Viscous fingering Moisture analysis Soil moisture sensors Water activity Water retention curve Robinson, David A. (2008), "Field Estimation of Soil Water Content: A Practical Guide to Methods, Instrumentation and Sensor Technology" (PDF), Soil Science Society of America Journal, 73 (4), Vienna, Austria: International Atomic Energy Agency: 131, Bibcode:2009SSASJ..73.1437R, doi:10.2136/sssaj2008.0016br, ISSN 1018-5518, IAEA-TCS-30 Wessel-Bothe, Weihermüller (2020): Field Measurement Methods in Soil Science.
Kelembapan udara, kadar air di udara Kelembapan Analisis kelembapan Sensor kelembapan tanah Aktivitas air Kurva tahanan air Field Estimation of Soil Water Content: A Practical Guide to Methods, Instrumentation and Sensor Technology (PDF), Vienna, Austria: International Atomic Energy Agency, 2008, hlm. 131, ISSN 1018-5518, IAEA-TCS-30