| A | B |
|---|
| barrel | raises the flame to a suitable height for heating |
| air-hole | to allow air to enter the burner |
| collar | to regulate the amount of air entering the air-hole |
| jet | to allow gas to rush out and to draw iair into the burner |
| base | to prevent the burner from toppling over |
| luminous flame | obtained when the gas has insufficient air for complete burning |
| non-luminous flame | obtained when there is sufficient air for complete burning of the gas |
| presence of soot (carbon particles) glowing in it | gives rise to orange colour of flame |
| coolest part of the flame | dark zone |
| dark zone contains | unburnt gas |
| just above the tip of the blue zone | hottest part of non-luminous flame |
| flame to be left unattended | luminous flame |
| flame to be used for heating purposes | non-luminous flame |
| place to insert a glass tube to piped out gas for burning | dark zone |
| strike back | caused by too strong a supply of air |
| turn off gas tap | action to take when there is a strike back |
| collar too hot to turn with bare fingers | when there is a strike back |
| orange colour of luminous flame | cause by presence of soot in it |
| flame at the jet | seen during a strike back |
| is heard during a strike back | hissing sound |
