DEFINITIONS OF UNIT SYMBOLS Btu: British thermal unit °C: degrees centigrade cm: centimeter GW: gigawatt (i.e., 10$ watts) GWe: gigawatt (electric) GW-yr: gigawatt-year J: joule K: Kelvin (unit of temperature) kg: kilogram km: kilometer kW: kilowatt kWe: kilowatt (electric) kWt: kilowatt (thermal) m: meter min: minute mm: millimeter m/s: meter per second mW: milliwatt MW: megawatt MWe: megawatt (electric) MWt: megawatt (thermal) MW-yr: megawatt-year pm: micrometer ppm: part per million (by weight) ppmv: part per million (by volume) t: metric ton (1,000 kg) W: watt
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