I understand that NHL hockey pucks are frozen before each game, plus they are basically on the ice at all times...What weighs more and what is actually harder?
An NHL puck is 1" thick and 3" in diameter and weighs between 5½ and 6 oz. An MLB baseball is about 2.9" in diameter and weighs between 5 and 5¼ oz. Computing the volume of a cylinder vs. sphere and computing the density shows the average puck is about 66% more dense than the average baseball. Density isn't the only measure of hardness however and there are many different measures and types of hardness such as scratch hardness, indentation hardness, rebound hardness, etc. Also the 'hardness' of something that hits you depends on the surface area it comes in contact with. Contrary to what many are saying, which one hurts you more isn't the true measure of hardness. Since a baseball is spherical it will tend to apply a greater pressure to a smaller contact area when it hits you and hurt you more. Similarly, a puck would tend to contact a larger surface area and apply less pressure despite being harder in most respects. This would vary a bit whether the puck hit you edgewise or on the flat side. Obviously speed plays a factor too, I think a struck baseball can travel faster than a puck Al Iafrate notwithstanding. If by hardness you simply mean molecular bonding, which is a pretty simplistic definition and not a discourse in physics, then a denser frozen puck wins hands down.
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