I see people caculating heat Quantity transferred as Q=Mass * Cp * delta T. All is good with this. But...
But they use weight in lieu of mass when they calculate.
In imperial units Cp of water is 1 BTU/lb-F. Isn't tis really lbm (pounds mass)? They really do as follows:
Q = lbf * 1 BTU/lbm-f *...