The nitrogen content in air is
By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases
The ___________ makes the windmill to rotate.
The blowing wind makes the windmill to rotate.
Air is a __________ of some gases.
Air is a mixture of a number of gases like Nitrogen, Oxygen and Carbon dioxide etc.
A weather cock show the ___________ in which wind is blowing.
A weather cock shows the direction in which wind is blowing.
Mountaineers carry oxygen ______________ with them, while climbing mountains.
Mountaineers carry Oxygen cylinder with them, while climbing mountains because air pressure is low at higher altitude.
The nose and mouth of traffic police at crossing is covered with
The nose and mouth of traffic police at crossing is covered with mask due to presence of high pollutants in air.
The presence of air around can be proved by
The presence of air around can be proved by feeling it when it moves.
The active part of air is
The active part of air is Oxygen that help in combustion and respiration.
A gas used for welding purpose is
Oxygen gas is used for welding purpose along with acetylene gas.
Which gas is produced on burning of fossil fuels
The burning of fossil fuels - like coal, oil and natural gas - releases gases into the air, mainly carbon dioxide, sulfur dioxide, methane and nitrous oxide.