Ethane is a chemical compound with chemical formula C 2 H 6 . It is the only two-carbon alkane, that is, an aliphatic hydrocarbon. At standard temperature and pressure, ethane is a colorless, odorless gas.

Ethane is isolated on an industrial scale from natural gas, and as a byproduct of petroleum refining. Its chief use is as petrochemical feedstock for ethylene production.

ETHANE is a mnemonic indicating a protocol used by emergency services to report situations which they may be faced with, especially as it relates to major incidents , where is may be used as part of their emergency action principles.

ETHANE dictates the form in which the receiving control station should get information from the first person or officer on scene. In some jurisdictions, the alternative CHALET may be used.

It stands for:

• Exact Location - The precise location of the incident
• Type - The nature of the incident, including how many vehicles, buildings etc. are involved
• Hazards - Both present and potential
• Access - Best route for emergency services to access the site, or obstructions and bottlenecks to avoid
• Numbers - Numbers of Casualties, Dead and Uninjured on scene
• Emergency Services - Which services are already on scene, and which others are required

In the event of this being used for a major incident, the reporting first on scene officer would not usually get involved with the rescue work, but act as a co-ordinator on scene for arriving emergency vehicles. This may be achieved by the vehicle being used by the first on scene should leave it's lightbar running, whilst all others should turn theirs off on arrival, to make identifying the incident officer easier.