QUICK TEST HELPP. One way to find out whether a substance will float or sink in a liquid is to compare the density of the substance to the density of the liquid. If the substance is less dense than the liquid,
the substance will float. If the substance is more dense than the liquid, the substance will sink.
1. Of the substances listed, which ones will float in water and which will sink?
-wood (pine), wax (tealight candle), and vegetable oil will float and clay, iron, and lead will sink
-clay, iron, and lead will float and wood, wax, and oil will sink

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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.