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A bold or italic p, mass times velocity.
Also known as: Linear momentum, Bold p, Momentum vector
p is momentum, and it is a vector — usually set in bold to say so. Its conservation is more fundamental than the formula mv suggests: the relativistic and quantum definitions differ from mv, and it is the conservation law rather than the formula that survives.
Denotes linear momentum, the product of mass and velocity in Newtonian mechanics.
Contexts: Laboratory
Is a vector quantity, conventionally set in bold or with an overarrow; the unbolded p is its magnitude.
Contexts: Laboratory
Departs from mass times velocity at relativistic speeds, where the Lorentz factor enters; conservation of momentum holds in both regimes.
Contexts: Laboratory
Collides with pressure, also p, and with probability in statistical contexts.
Contexts: Laboratory
An italic or bold lowercase letter p, a vertical stroke with a bowl on its right and a descender below the line.