There is really no such thing as a "liquid" unit. The unit of measure is for the VOLUME of something. The best unit for measuring the volume of a human bathtub would be the "Litre".
you would use gallons to measure the capacity of a bathtub
with white spirit. (its a fact)
The best metric unit to measure the amount of water in a full bathtub is liters (L) or cubic meters (m³). Liters are commonly used for measuring smaller volumes like the ones typically found in a bathtub, while cubic meters are used for larger volumes.
The best way to measure a highway is in miles.
To repair a seal crack in a bathtub, the best way is to use a waterproof sealant or caulk specifically designed for bathroom surfaces. Clean the area thoroughly, apply the sealant, and smooth it out with a putty knife. Allow it to dry completely before using the bathtub again.
the best way to measure mass is using grams
Gallons
gallons
The best method for repairing a broken bathtub using bathtub glue is to thoroughly clean and dry the area, apply the bathtub glue according to the manufacturer's instructions, and allow it to cure completely before using the bathtub again.
The capacity of a bathtub could be appropriately measured in liters.
The best way to repair a broken bathtub handle is to first identify the cause of the breakage, then purchase a replacement handle that matches the make and model of your bathtub. Next, follow the manufacturer's instructions to remove the old handle and install the new one securely. If you are unsure or uncomfortable with the repair process, it is recommended to seek the help of a professional plumber.