mass: the amount of matter that an object contains
weight: how strongly the mass is pulled by gravity (eg an astronaut is weightless in space but has the same mass as on Earth)
Terms to watch out for
mass, weight
may
See can, may, might
may be, maybe
may be (verb): could possibly be
The result may be surprising.
maybe (adverb): perhaps
Maybe the results will surprise you.
maybe
See may be, maybe
mean
median
medication
medicine
meteor
meteorite
meteoroid
method, methodology
method: a process or technique
methodology: the general strategy of how a research project will be done, including identification of the methods to be used
methodology
microbe
microorganism
might
See can, may, might
mode
molecular mass, molecular weight
molecular weight (MW): the ratio of the mass of a molecule to the standardised mass of an atom (note that MW does not take a unit because it is a ratio)
molecular mass: the mass of a substance divided by the amount of substance; usually expressed in daltons (Da) where 1 Da = 1 gram/mole
molecular weight
morphology
mutant, mutation
mutant: an organism carrying one or more mutations
mutation: an alteration in the primary sequence of the genetic material that can be mapped to a specific place (locus) on the DNA
mutation
See mutant, mutation