ﻫﻮ ﻣﻴﺰﺍﻥ ﺣﺮﺍﺭﺓ ﻛﺤﻮﻟﻲ, ﻳﺸﺒﻪ ﻣﻴﺰﺍﻥ ﺍﻟﺤﺮﺍﺭﺓ
ﺍﻟﺰﺋﺒﻘﻲ, ﻏﻴﺮ ﺃﻧﻪ ﻳﻮﺟﺪ ﻓﻲ ﺃﻧﺒﻮﺑﺔ ﺍﻟﻤﻴﺰﺍﻥ ﺍﻟﻜﺤﻮﻟﻲ ﻣﺆﺷﺮ ﺯﺟﺎﺟﻲ ﻳﺴﺘﻄﻴﻊ ﺍﻟﻜﺤﻮﻝ ﺗﺤﺮﻳﻜﻪ ﺑﺤﺮﻳﺔ ﺗﺠﺎﻩ ﻣﺴﺘﻮﺩﻉ ﺍﻟﻤﻴﺰﺍﻥ, ﻏﻴﺮ ﺃﻧﻪ ﻻ ﻳﺴﺘﻄﻴﻊ ﺗﺤﺮﻳﻜﻪ ﺑﻌﻴﺪﺍً ﻋﻦ ﺍﻟﻤﺴﺘﻮﺩﻉ, ﻭﻫﺬﺍ ﻳﻌﻨﻲ ﺃﻧﻪ ﻋﻨﺪ ﺍﻧﺨﻔﺎﺽ ﺩﺭﺟﺔ ﺍﻟﺤﺮﺍﺭﺓ ﻳﻨﻜﻤﺶ ﺍﻟﻜﺤﻮﻝ
ﺗﺠﺎﻩ ﺍﻟﻤﺴﺘﻮﺩﻉ ﺳﺎﺣﺒﺎً ﻣﻌﻪ ﺍﻟﻤﺆﺷﺮ ﺍﻟﺰﺟﺎﺟﻲ ﺍﻟﺬﻱ ﻳﺒﻘﻰ ﻓﻲ ﻣﻜﺎﻧﻪ ﺣﺘﻰ ﻟﻮ ﺍﺭﺗﻔﻌﺖ ﺩﺭﺟﺔ ﺍﻟﺤﺮﺍﺭﺓ ﻭﺗﻤﺪﺩ ﺍﻟﻜﺤﻮﻝ ﻣﺘﺠﺎﻭﺯﺍً ﺍﻟﻤﺆﺷﺮ, ﻭﻫﺬﺍ ﻣﺎ ﻳﺘﻴﺢ ﻓﺮﺻﺔ ﻗﻴﺎﺱ ﺩﺭﺟﺔ ﺍﻟﺤﺮﺍﺭﺓ ﺍﻟﺼﻐﺮﻯ ﻓﻲ ﺃﻱ ﻭﻗﺖ.
*ﺍﻟﻤﺼﺪﺭ: ﺍﻟﻤﻌﺠﻢ ﺍﻟﺠﻐﺮﺍﻓﻲ ﺍﻟﻤﻨﺎﺧﻲ*