A metallic apparatus which supports the wire gauze is 

The burning sensation of chilly pepper is due to the presence of chemical

The study of forces and their effects are coming under

Luminous flame occurs when the air-hole is

The cigarette lighter was invented by

An apparatus used for holding several test tubes is

Which of the following connects the barrel of the Bunsen burner to the source of gas?

The main gas present in L.P.G

Chemical substance which prevent the growth of micro-organisms or kill them but are not harmful to the living human tissues are called