what is an.ounce
2.An ounce is measuring weight while a fluid ounce is measuring volume. 3.One pound is equal to 16 ounces while one pint is equal to 16 fluid ounces. 4.One fl. oz. is equal to 29.5735297 ml. using the U.S. Customary system. 5.One âoz.â is approximately 28.3495231 grams using the international avoirdupois system.