It is to hold different flask types of chemicals to mix them to make chemical reactions in liquid phase..
nothing
a river barge will generally be flat bottomed, so that it can go up rivers
Sunfish
LOVE..........
alcohol
ferryboat
A flat bottomed boat is best, as the river, lake or pond may be shallow in places. A punt, propelled by a pole, is one such flat bottomed water craft.
any of various flat-bottomed boats with sloping ends
Flat bottomed flask is used to hold different types of chemicals and mix them. This also used to avoid liquid from spilling.
A flat boat is a flat-bottomed boat used to float goods and passengers downriver.
A gondola.
Flatboat