の重さ

weight

→ の
phrase Rare #21,913
weight The の marks what the weight belongs to, so の重さ means “the weight of …” or “someone’s/something’s weight.”
JA: この箱の重さはどのくらいですか?
EN: How much does this box weigh?

屋根全体の重さを支えていた

The walls were supporting the weight of the entire roof.

の重さ折れてしまった

The branch broke under the weight of the snow.

硬貨の価値は使われた金属の重さによって決まった

The value of a coin was determined by the weight of the metal used.

このスーツケースの重さどれくらいあると思う

How heavy do you think this suitcase is?

この箱の重さはどれくらいあるの

How much does this box weigh?

あれってこれと同じくらいの重さかな

Do you think that’s about as heavy as this?