What is the term that scientists use when comparing properties of solids, liquid, gases

1) these are barrel shaped microtubules in most animal cells, that organize the spindles during cell division

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit