british thermal unit   (TTS Sound)

The british_thermal_unit has 1 Senses.

• british thermal unit, btu, b.th.u.
• 基本伝送単位
• a unit of heat equal to the amount of heat required to raise one pound of water one degree Fahrenheit at one atmosphere pressure; equivalent to 251.997 calories
• 熱量単位で、1気圧の下で1ポンドの水の温度を華氏1度上げるのに必要な熱量と等しい