noun
Physics term for the amount of a substance or element present in a given environment, often relative to other components.
宇宙におけるヘリウムの存在量は水素に次いで多い。
The abundance of helium in the universe is second only to hydrogen.
noun
stock; amount on hand; existing amount
General term for the quantity of something that exists or is available, such as inventory, resources, or funds.
倉庫の在庫存在量を確認してください。
Please check the stock amount in the warehouse.
この地域の水資源の存在量は年々減少している。
The existing amount of water resources in this region is decreasing year by year.