Although there could be others, the primary gas is Hydrogen [H2], and sometimes Hydrogen Sulphide [H2S].
If and when mixed in the proper ratio with the air, both of these gasses are highly explosive!!!!!
Car battery vapor is hydrogen gas and is extremely explosive.
corrosion of copper, from battery acid vapors, most likely.
That steam as you call it is highly explosive. Get it checked immediately by a qualified mechanic.
B/c what's vented is hydrogen, which together with oxygen is explosive.
Exploding Automotive BatteriesAuto batteries are usually of the Lead-Acid type and thus generate explosive gasses [Hydrogen (H2) and sometimes Hydrogen-sulphide (H2S?)]. These gasses accumulate in the head-space in the battery, and are emitted from the battery at the vent openings. Any kind of spark which occurs inside the battery or in the explosive gas envelope outside but near the battery, can ignite the explosive gasses thus causing an explosion. Even a spark/explosion starting outside the battery can ignite the gasses inside the battery and cause the battery itself to explode.In your case, with only 3K miles on the battery [for all practical purposes a brand new battery] I suspect that an internal flaw/fault due to a manufacturing defect or defective materials led to/caused the ignition.All of this is based on the assumption that you, or no one else, tampered with, misused, or abused the battery during that 3K miles.Without an exhaustive examination/investigation of the remains of the battery it is not possible to determine the actual fault/flaw causing the failure.
chemical change
The car emitted a lot of nasty gases.She emitted her opinions openly and proudly.
It absorbs the gasoline vapors from the fuel tank while the car is parked. Once you start the car the vapors fromm the charcoal canister are purged back into your engine and burned.
They contain sulfuric acid which is highly corrosive. The battery also emits small quantities of hydrogen gas which is highly explosive.
No ! Batteries give off hydrogen gas which is highly explosive. Also, Battery chargers have been known to catch on fire so using one indoors is foolish.
Chitty Chitty Bang Bang
The battery has internal problems and/or the vehicle is overcharging and is probably giving off explosive fumes. Don't do anything to cause a spark anywhere near the battery and take it to a repair shop asap for diagnoses.