Question: Convert units and adopt the new unit in to the value

Using with(Units) If I enter something like: P := 1 [[atm]] And then right click to convert this to torr, it does so like this: P := 1 [[atm]] -> 760 [[torr]] But then, if I check the value of P, it is still given in [[atm]]. How can I make the new units append to the previous value? In general, I'm having a difficult time working with units in Maple. Any suggestions?
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