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Feb18-12, 06:37 AM
P: 17,330
Quote Quote by twofish-quant View Post
Doesn't work that way. I have a device that has a switch "metric" versus "English." If I flip the switch, the system uses different logic to come up with the number that gets displayed on the LCD. The fact that I can change the number displayed based on the system makes it a non-scalar.

We don't. We can flip the switch in the measuring device and get different numbers.
That is a different measurement. Yes, different measurements can have different results.

The question about whether or not a quantity is a scalar has nothing to do with flipping switches, just about changing coordinates. Regardless of the coordinate system used to analyze the experiment the number does not change, it is therefore a scalar.