The hand grenade currently employed by most armies has a kill radius of 5 meters and danger radius of 15 meters.
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If a soldier would throw himself on a (hand) grenade, then his body would absorb much of the blast. He will most likely be killed, but the grenade won't do much other damage.
Steel splinters are provided by the grenade casing and produce a casualty radius of 15 meters, with a fatality radius of 5 meters, though some fragments can disperse as far out as 250 meters.
The term "hand grenade" implies that it was thrown by hand, instead of being propelled by other means as with a rifle grenade or an automatic grenade launcher, which incidentally were not invented in ancient China. The first grenades were hand grenades since there was no other way to propel them, yes?
grenade
Yes.