'Span' in the Bible

The breastpiece shall be square and folded double; a span [about nine inches] in length and a span in width.

It was square; they made the breastpiece folded double, a [hand’s] span long and a [hand’s] span wide when folded double.

Then a champion came out from the camp of the Philistines named Goliath of Gath, whose height was six cubits and a span.

Who has measured the waters in the hollow of His hand,And marked off the heavens with a span [of the hand],And calculated the dust of the earth with a measure,And weighed the mountains in a balanceAnd the hills in a pair of scales?