Quantities. Buy Diethyl Ether : Diethyl ether also known as ethyl ether bears the formula (C2H5)2O, Density: 713 kg/m³. It is a colorless, volatile and highly flammable liquid which has been in existence way back from the 8th century. It is heavier than air and does not need an ignition source like flame, just hot plates, steam pipes or even