which type of circuit makes for the best strand of holiday light?(series or Parallel) (A series circuit is better for holiday lights because if one bulb breaks the rest of the lights will still work). (A parallel circuit is better for holiday lights because if one bulb breaks the rest of the lights will still work.) (They both work the same and can keep all the lights on even if one bulb goes out.)

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.

the enthalpy change that occurs in a system when matter is transformed by a given chemical reaction, when all reactants and products are in their standard states.