In coordination chemistry, it is common to use “non-coordinating” anions as counterions for cationic complexes. These anions are essentially inert, and do not interfere in the study of the coordination complexes. A very common example is hexafluorophosphate, PF6–. Why do you think that PF6– is used more often than BF4–? Ignore any solubility concerns.

can you attach the

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

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