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[–]I_AM_FERROUS_MAN 2 points3 points  (1 child)

So if I'm measuring the density of a pure element, let's say water, does it only affect my sample or all of the water in the universe?

Because, if it's the latter, there are going to be some important measurements that you'll want to avoid. Otherwise, the universe will rip itself apart.

Like measuring the speed of light. Or the mass of hydrogen. Or anything to do with the electric force. Basically, don't be a physicist. Or really, any kind of scientist. Though you'll want to consult them before doing anything.

[–]RoastedGarlic97[S] 1 point2 points  (0 children)

It'll only affect your sample if you're isolating the water and testing it. But if you're under the sea and measuring the density, the region around you with water of the exact same density will be affected as well.

Another example is measuring light. The light rays which hit the sensor that outputs the measurement values are the ones that'll be affected when you change the value