|Stone wall, corner of Maple and Brooks Streets. Estimated|
weight six tons. Click on photos to enlarge.
Stone is heavy. Every stone mason who has ever blackened a fingernail knows this to be true. Granite weighs 165-170 pounds per cubic foot. One 2x3 foot piece of bluestone for a walkway, two inches thick, weighs 150 pounds. Filling a wheelbarrow with gravel will exceed the safe load capacity of the wheelbarrow. Tons of stone are needed for a not particularly long or tall stone wall.
|Salt crystal melts surrounding snow.|
Because of the salt content, ocean
water freezes at 28F. Water with a
higher salt content would have an
even lower freezing temperature.