Chemical |
gallons of gasoline (
pounds) |
pounds of natural gas (
cubic feet at
psi), |
pounds of hydrogen Gas (
cubic feet at
psi), |
a lead-acid battery weighing
pounds |
Mechanical (Kinetic) |
a high-tech flywheel weighing about
pounds |
a
pound car traveling at
miles per hour |
Thermal |
melting a block of ice weighing
pounds |
heating a
gallon tank of water by
degrees F. |
evaporating
pounds (about
gallons) of water |
heating a
pound hunk of concrete by
degrees. |