in the city a street peddler offers to sell you a diamond ring for thirty bucks. how could you test if the rock in the ring is a real diamond?

try fogging it up with your breath. If it clears up after one or two seconds, then your diamond is real, but if it stays fogged for three to four seconds chances are that you’re looking at a fake.

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it