need help with this question

Miss chovi is confused by the fact that the scuba tanks she uses in the diving courses are listed separately in the trial balance to those scuba tanks she has in the shop for sale ( which are included in inventory balance). Using the appropriate element* definition, apply the facts provided and explain to Miss Chovi what element* both inventory and the separate account Scuba tanks are recorded as.

*(element = Asset, Liability, Equity, income or expense)