Table 4. Soil water

Term	Symbol (a)	Dimension	Unit
(a) Symbols such as C, K, and D may have w or h as a subscript if in the same paper they are used for water as well as For heat. (b) The dimension depends on the units used to describe the driving force, as in the following table.
Total potential	L²T²	erg g¹, joule kg¹
Osmotic potential	O	L²T²	erg g¹, joule kg¹
Gravitational potential	Z	L²T²	erg g¹, joule kg¹
Matric potential	M	L²T²	erg g¹, joule kg¹
Soil water pressure	-	ML¹T²	dyne cm², bar, cm water, cm Hg
Osmotic pressure	-	ML¹T¹	dyne cm², bar, cm water, cm Hg
Total pressure	-	ML¹T²	dyne cm², bar, cm water, cm Hg
Hydraulic head	H	L	cm, m
Hydraulic potential	Ø	L²T²	erg g¹, joule kg¹
Water content	w	-	cm³ cm³, g g¹
Differential water capacity	C	M¹LT²	cm² dyne¹, bar¹
Hydraulic conductivity	K	(b)	(b)
Permeability	k	L²	cm², Darcy
Soilwater diffusivity	D	L²T¹	cm²sec¹

Driving force	Dimension	Hydraulic conductivity
		Dimension	Unit
Hydraulic potential gradient	LT²	T	sec
Hydraulic head gradient	LL¹	LT¹	cm sec¹
Pressure gradient	ML²T²	M¹L³T	g¹ cm³ sec

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