I cannot find the answer anywhere on the web. Here are some hints:
- one grain of sand has a volume of 1.3 * 10^-9 cubic feet (from gomath.com)
- Some people on abc.net.au tried to figure out how many grains of sand are on earth.
- Hypertextbook.com says the volume varies between 1.13 √ó 10-13 m3 and 4.85 √ó 10-9 m3
- There’s a group of 13 people that spent 1,000 hours counting 3,281,579 grains of sand. There’s a photo on their webpage at multiply.com.
Okay smartypants, if anyone out there can find the answer to how many grains of sand fit into one cup volume, then you are the first person ever to figure that out.