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| | UK's National Pressure Standards - Pressure units |
 | | In the fullness of time, when their second-class nature is more widely appreciated, market forces will doubtless operate and naturally cause end users to abandon them. |
 | | The end is in sight for the so called manometric pressure units, such as inches of water, millimetres of water, inches of mercury and millimetres of mercury, but a large part of the pressure community seems unaware of the potential problems in store for them. |
 | | In order to encourage the demise of non-SI units, whose definitions are becoming inadequate for the most precise measurement of pressure, there is international effort to exclude them from conversion tables or, in the meantime, restrict the precision of newly published conversion factors. |
| www.npl.co.uk /pressure/punits.html (883 words) |
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