# ten cubits ... five cubits ... thirty cubits

A cubit is 46 centimeters. Alternate translation: "4.6 meters ... 2.3 meters ... 13.8 meters" (See: [[rc://en/ta/man/translate/translate-bdistance]])

# the round sea

This refers to a tank or basin that would hold water.

# cast metal

This is metal that was melted then formed in a mold.

# from brim to brim

"from one edge to the other"

# in circumference

Circumference is the distance or measurement around a circular object or area.