The question cannot be answered. A square metre is a measure of area not of volume. A block of lead, with an area of 1 square metre could be a few atoms thick or several metres thick. Their weights will differ considerably.
4 cm
assume 4" thick. 4"x48"x192"/(36"x36"x36") = 0.79 yards 36" in a yard
A 4 mil thickness is four thousandths (0.004) of an inch.
2 cm (3/4") or 3 cm (1-1/4").
approx 30Kg (code 6 lead is 2.8mm thick and the density of lead is 11000 Kg per cubic metre)
Code 7 (3.15mm thick) is used for Vertical Cladding, pamet Boxes, Gullys and gutters. Code 8 (3.5mm thick) is used for pampet boxes, gullys and gutters
rule lead code
depends on the piece of lead.
a thick layer of lead
Gamma radiation
yes there is it is called Thick String yes there is it is called Thick String
The lead of a common pencil.
gamma rays
about 4 inches thick
yes, but there is only one known material that can stop it, lead
An eight inch thick lead shield.