16 units::compound_unit<units::length::inches, units::inverse<units::time::second>>);
18 inches_per_second_squared,
19 inches_per_second_squared,
21 units::compound_unit<units::length::inches, units::inverse<units::squared<units::time::second>>>);
UNIT_ADD(velocity, inches_per_second, inches_per_second, ips, units::compound_unit< units::length::inches, units::inverse< units::time::second > >)