How much does a human eyeball weigh? According to some sources, the average human eyeball weighs approximately one ounce. Other sources quote a figure of only 7.5 to 8 grams (0.3 ounce). Based on a total volume oâ¦f 6.5 milliliters, the lower figure seems more accurate.
Prices run from a low of about $15 for 25 feet of 1/2-inch conduit to $80 or more for the same length of 2-inch conduit. Rigid nonmetallic conduit is made of PVC, and working with it is similar to working with PVC plumbing pipe.
Cost comparisons. 1  InvisalignÂ® Express, the company's lowest-priced system, costs the dentist on the order of $750 per case (2008). 2  In comparison, the RW IIÂ®, Red White & BlueÂ®, and Simpli 5Â® systems cost the dentist around $180, $225, and $600, respectively (2008).