What is the difference if any between 8 fl oz and 8 oz?

There is no difference between 8 fl oz and 8 oz when referring to fluid measurements; both indicate a volume of 8 ounces. However, "fl oz" specifically denotes fluid ounces, which are used for measuring liquids, while "oz" can refer to either fluid ounces or avoirdupois ounces (weight). In contexts where precision is important, clarifying whether the measurement is for volume or weight is essential.