Final answer:
The missing unit or context required to make sense of the given information is mass.
Step-by-step explanation:
The missing unit or context required to make sense of the given information is mass. After drying the product in an oven for 2 hours at 85 degrees, there is no information given about the mass, volume, or time of the product. Without knowing the mass, it is impossible to determine any meaningful information about the product.