Hello guys :)
I am now doing a comparative study on a single-use coffee cup and a polypropylene coffee cup that can be collected, cleaned and reused for 400 times. Both cups are the medium size (280ml), I know I should set the functional unit to be the same for all compared product systems. So can I use the functional unit as:
"All materials and energy used to make 280ml coffee cups that can serve 11200ml coffee drinks totally. "
for a cradle-to-grave study?