Final answer:
To convert 197 feet to millimeters, multiply by the conversion factor of 304.8 mm/ft, resulting in 60,046.6 millimeters.
Step-by-step explanation:
To convert the length of the Pacific kelp from feet to millimeters, we first need to know the basic conversion factors. One foot is equivalent to 304.8 millimeters. Given that the Pacific kelp is the longest growing kelp in the world at 197 ft, we use the following calculation to convert this to millimeters:
Length in millimeters = Length in feet × Conversion factor
Length in millimeters = 197 ft × 304.8 mm/ft
Length in millimeters = 60,046.6 mm
Therefore, the Pacific kelp being 197 feet long is equal to 60,046.6 millimeters.