Definition
A white crystalline chemical compound (sodium bicarbonate, NaHCO3) used as the active agent in dry-chemical fire extinguishers and in aircraft battery servicing, where it neutralizes acid spills from lead-acid batteries.
Plain English
Baking soda. The same household powder used in cooking is also used in aviation to put out fires and to safely clean up acid leaks from batteries.
Context Anchor
Seen in aircraft maintenance, especially during battery servicing and in discussions of powder-type fire extinguishers.
Derivation
Bicarbonate comes from the Latin bi- (two) and carbonate (a salt of carbonic acid), referring to its chemical makeup. Soda is an old term for sodium-based compounds. Together the name simply describes the chemistry of the powder.
Why Pilots Care
Certain onboard extinguishers rely on this agent to suppress fuel or electrical fires without leaving conductive residue that could damage avionics.
Intuition Check
Do not think of bicarbonate of soda only as a kitchen item. In aircraft use, it is a maintenance and safety material used for neutralizing acid and as part of some fire-extinguishing powders.
Example Sentence 1
After the battery vented during charging, the technician sprinkled bicarbonate of soda on the spilled electrolyte to neutralize the acid before wiping it up.
Example Sentence 2
Ground crew applied a bicarbonate of soda solution to neutralize acid spills on the ramp.