http://www.discoverabroad.com/US/LivingAbroad/money/USCoinage.htm (http://www.discoverabroad.com/US/LivingAbroad/money/USCoinage.htm)
"Nickel:
Value: Five cents
Pictures on both side of the coins: Jefferson and Monticello
Standard weight: 5.0 grams
Standard diameter: 0.835 in. or 21.21 mm
Thickness: 1.95 mm
Edge: Smooth"
Exactly five grams! :)
PB
It's not at the bottom, and it's not at the top, but this is the stair where I always stop.