TN temperature under normal (s.t.p.) conditions
TS total solids content
V volume
v velocity/speed
vc maximum gas consumption
Vd digester volume
Vg gasholder volume
Vh compression volume
VN volume of biogas under normal (s.t.p.) conditions
Vn swept volume
VS volatile solids content
Vtot total volume of a cylinder
W water
W watt
Wd daily water input
wE weight of dry earth
Wl water loss (leak testing)
wW weight of water
Ztot sum total of friction losses
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