their velocity or their velocities?

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Mechyao

Member
Chinese-China
Their (A, B, C, etc.) velocity can be obtained by extrapolation method.
or
Their (A, B, C, etc.) velocities can be obtained by extrapolation method.

Likewise, "their pressure" or "their pressures"?

Thank you!
 
  • Glenfarclas

    Senior Member
    English (American)
    If their velocities are being considered independently (although by chance they might happen to coincide), then you would use "velocities." It's the same answer as in this previous thread from a couple of weeks ago about "temperature vs. temperatures."
     
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