Erlenmeyer flasks are used mainly for mixing chemicals and for observing reactions. It can also be used to measure and store chemicals. The narrow top helps avoid splashing when mixing chemicals. It also protects the scientist from a quick reaction because you can put a stopper on the top. Erlenmeyer flasks are not precise for measuring volume.
is the quantity of matter in a body. More specifically, it is the measurement
of the inertia or sluggishness that a body, in the absence of
friction. Two items that have the same dimensions could have different
masses, and two different sized objects could have similar mass. Mass does
not change whether you are in space or on Earth. Mass is measured in
kilograms and grams (metric) and slugs (English).