gj

GJ is the abbreviation for gigajoule, the SI unit of energy equal to 1 × 10^9 joules. The joule is the base SI unit of energy, and the gigajoule is formed by applying the prefix giga- (10^9) to the joule. The term is used in engineering and energy contexts to express large energy quantities.

One gigajoule equals 1,000,000,000 joules. In more commonly used energy units, it is about 277.8 kilowatt-hours (kWh), or 0.2778 megawatt-hours (MWh). It is also roughly 0.9478 one thousand British thermal units (MMBtu) and about 0.239 tonnes of TNT, illustrating its scale relative to other energy measures.

GJ is frequently employed to quantify energy content and consumption in industrial and energy-sector applications. It appears in contexts such as the energy content of fuels (coal, oil, natural gas), heating requirements, and electricity generation planning. For natural gas, energy content may be stated in gigajoules per cubic meter or per cubic foot, depending on regional conventions.

In usage, the gigajoule serves as a practical unit when dealing with large energy amounts while remaining compatible with the SI system. While kilojoules and megajoules are used for smaller-scale measurements, the gigajoule provides a convenient scale for comparing energy production, consumption, and fuel energy content across industries.