EXPERIMENT 1: DENSITY OF A SUBSTANCE Data Sheet Table1: Isopropyl Alcohol Data Measurement Result Mass of 10 mL graduated cylinder (g): 33.5g Volume of alcohol added to graduated cylinder (mL): 10ml Mass of graduated cylinder and alcohol (g): 40.3g Mass of alcohol (g): 6.8g Calculated density of alcohol (g/cm3): Actual density of isopropyl alcohol: 0.790 g/cm3 Experimental error (use equation below):

what's 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.