Absement
Measure of sustained displacement of an object from its initial position / From Wikipedia, the free encyclopedia
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In kinematics, absement (or absition) is a measure of sustained displacement of an object from its initial position, i.e. a measure of how far away and for how long. The word absement is a portmanteau of the words absence and displacement. Similarly, absition is a portmanteau of the words absence and position.[1][2]
Absement | |
---|---|
Common symbols | A |
SI unit | metre-second |
In SI base units | m·s |
Dimension | L T |
Absement changes as an object remains displaced and stays constant as the object resides at the initial position. It is the first time-integral of the displacement[3][4] (i.e. absement is the area under a displacement vs. time graph), so the displacement is the rate of change (first time-derivative) of the absement. The dimension of absement is length multiplied by time. Its SI unit is meter second (m·s), which corresponds to an object having been displaced by 1 meter for 1 second. This is not to be confused with a meter per second (m/s), a unit of velocity, the time-derivative of position.
For example, opening the gate of a gate valve (of rectangular cross section) by 1 mm for 10 seconds yields the same absement of 10 mm·s as opening it by 5 mm for 2 seconds. The amount of water having flowed through it is linearly proportional to the absement of the gate, so it is also the same in both cases.[5]