how 2 measure in older days by span?what is the meaning of span?

Answer 1

(A hand span)...In olden days they would measure things by opening their hands wide (a span) and count how many times their hand would fit into that thing.

Answer 2

1 span = International units
0.229 m 228.6×10−6 km
228.6 mm 2.286×109 Å
1.528×10−12 AU 24.163×10−18 LY
US customary / Imperial units
9 in 0.75 ft
0.25 yd 142.045×10−6 mi

Three archaic hand units of measurment:
1: Hand = 4 inches = 10.16 cm
2: Span = 9 inches = 22.86 cm
3: Palm = 3 inches = 7.62 cm
Span is the width of a human hand, from the tip of the thumb to the tip of the pinky finger. See also: English unit

1 span
= 9 inches
= 0.2286 m
In Slavic languages, the analogue of span is pyad (peti, пядь). It is the width from the tip of the thumb to the tip of the forefinger. See also: Obsolete Russian weights and measures

1 pyad
= 4 vershok
= 7 inches
= 0.1778 m

Answer 3

You have the answer, but it is aproximately on an avarage 9 inches.