Conversions can be done either with the "->" conversion operator or with the equivalent "convert" function. The function has three parameters: a quantity, a unit to convert from and a unit to convert to. Likewise the conversion operator uses three values: the quantity and unit to convert from are placed on the left side of the operator while the unit to convert to goes to the right side.
The basic unit of pressure is the pascal. All units of pressure are expressed in terms of this base unit and so measurements can be converted from any one of the following units to any other.
10 pascals -> atm = 0.0000987
convert(10; pascals; atm) = 0.0000987
10 pascals -> bars = 0.0001
convert(10; pascal; bar) = 0.0001
10 pascals -> PSI = 0.0014504
convert(10; pascals; psi) = 0.0014504
10 pascals -> inchHg = 0.002953
convert(10; pascals; inchHg) = 0.002953
10 pascals -> torrs = 0.0750062
convert(10; Pascal; Torr) = 0.0750062
10 atm -> pascals = 1,013,250
convert(10; atm; pascals) = 1,013,250
10 bars -> pascals = 1,000,000
convert(10; bars; pascals) = 1,000,000
10 inchHg -> pascals = 33,863.788
convert(10; inchHg; pascals) = 33,863.788
10 torrs -> pascals = 1,333.2237
convert(10; Torr; Pascal) = 1,333.2237
10 psi -> cmHg = 51.714933
convert(10; PSI; cmHg) = 51.714933
10 baryes -> torrs = 0.0075006
convert(10; barye; torr) = 0.0075006
10 torr -> barye = 13,332.237
convert(10; torrs; baryes) = 13,332.237