Acryogenic vacuum pump works by condensing vapors onto some absorbent medium. this is an efficient and clean way to pump a system in a research environment. the term cryo means cold, which indicates that these types of vacuum pumps contain a refrigerant cycle to cool the internal parts. the temperature difference between the inside and outside of a typical cryogenic pump is δ=300 ∘c . derive an expression to convert this difference into fahrenheit and express the answer

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.

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.