ﺗﺴﺘﺨـﺪﻡ ﻟﻘﻴـﺎﺱ ﻛﻤﻴـﺔ ﺍﳌـﺎﺩﺓ، ﻭﲤﺜﻞ ﻣـﻘـﺪﺍﺭ ﺍﳌـﺎﺩﺓ ﺍﻟﻨﻘـﻴـﺔ ﻣﻦ 6 02 X 1023 ﺍﻟﺘﻲ ﲢﺘﻮﻱ ﻋﲆ ﺍﳉﺴﻴﲈﺕ ﻣﺒﺪﺃ ﺃﻓﻮﺟﺎﺩﺭﻭ ﺍﳊﺠﻢ ﺍﳌﻮﻻﺭﻱ Rﺛﺎﺑﺖ ﺍﻟﻐﺎﺯ ﺍﳌﺜﺎﱄ ﻗﺎﻧﻮﻥ ﺍﻟﻐﺎﺯ ﺍﳌﺜﺎﱄ The Ideal Gas Law ﺍﻟﻐﺎﺯ ﰲ ﺃﻱ ﻋﻴﻨﺔ ﺗﻜﻮﻥ ﻣﺘﺒﺎﻋﺪﺓ ﻛﺜﲑﹰﺍ ﺟﺪﹼﹰﺍ، ﺑﺤﻴﺚ ﻳﺼﺒﺢ ﺗﺄﺛﲑ ﺣﺠﻢ ﺍﳉﺴﻴﲈﺕ ﻗﻠﻴﻼﹰ ﺟﺴﻴﻢ ﻣﻦ ﻏﺎﺯ ﺍﻟﻜﺮﺑﺘﻮﻥ ﺍﻟﻜﺒﲑﺓ 1000 ﺟﺪﹼﹰﺍ ﺣﻴﺚ ﻳﺬﻭﺏAl2O3 2H2O ﺍﻟﻜﻬﺮﺑﺎﺋﻲ ﻷﻛﺴﻴﺪ ﺍﻷﻟﻮﻣﻨﻴﻮﻡ ﻭﺍﳌﻜﺮﺭ ﻣﻦ ﺧﺎﻡ ﺍﻟﺒﻮﻛﺴﻴﺖ