Definition

Noun: A grayish-black, crystalline chemical compound with the formula CaC₂. It is primarily used industrially to produce acetylene gas (C₂H₂) when it reacts with water.

Usage

Calcium carbide is a specific chemical substance. It is typically discussed in industrial, chemical, or historical contexts. * It is an uncountable noun. You do not say "a calcium carbide" or "calcium carbides." * It is often preceded by words like "lump of," "piece of," or measurements like "kilogram of."

Examples

• Industrial Process:
• Historical Use:
• Chemical Property: Calcium carbide reacts violently with water to release flammable acetylene gas.

Advanced Usage

• "Calcium carbide lamp": A historical lamp, often used in mining or caving, that produces light by burning acetylene gas generated from calcium carbide and water.
  • The spelunker used a vintage calcium carbide lamp to explore the cave.
• "Calcium carbide method": An agricultural or horticultural technique where calcium carbide is used to induce flowering in plants like mangoes by generating ethylene gas.
  • Some farmers use the calcium carbide method to force mango trees to bear fruit out of season.

Variants and Related Words

• Carbide (n): A broader chemical term for a compound composed of carbon and a less electronegative element. Calcium carbide is one specific type.
  • Tungsten carbide is used to make very hard cutting tools.
• Acetylene (n): The flammable gas (C₂H₂) produced when calcium carbide reacts with water.
  • Oxy-acetylene torches are used for cutting and welding metals.

Synonyms

• CaC₂: The chemical formula, used as a technical synonym in scientific contexts.
• Calcium acetylide: A less common systematic name for the compound.

Notes on Meaning

This word has a single, specific chemical meaning. There are no common idiomatic or phrasal verb uses associated with it, as it refers to a concrete industrial material.

Noun

1. a grey salt of calcium (CaC) used in making acetylene