Rank the size of a change in temperature of one degree fahrenheit, one degree celsius, and one kelvin. in other words, if a thermometer were to show that the temperature outside increased by these amounts, which change would feel the largest? if any of the options are the same magnitude, stack them above one another. rank the sizes of one degree in each scale from largest to smallest. to rank items as equivalent, overlap them.

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.