from SI import kilogram

#
# Definitions of common mass units
# Data taken from Appendix F of Halliday, Resnick, Walker, "Fundamentals of Physics",
#     fourth edition, John Willey and Sons, 1993

gram = 1e-3 * kilogram

metric_ton = 1000 * kilogram

ounce = 28.35 * gram
pound = 16 * ounce
ton = 2000 * pound