You have 738.1 ml of 3.08 M HCl. Using a volumetric pipet, you take 324.94 ml of that solution and dilute it to 884.39 ml in a volumetric flask. Now you take 100.00 ml of that solution and dilute it to 168.23 ml in a volumetric flask. What is the concentration of hydrochloric acid in the final solution

the product of the pressure and volume is also constant

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.