What is the API test requirement for a substance to float on water?

The requirement for a substance to float on water is determined by its specific gravity in relation to that of water, which has a specific gravity of 1. If a substance has a specific gravity greater than 10, it indicates that it is significantly denser than water under standard conditions, which is generally expressed in a format where the specific gravity is compared to water.

When considering the provided options, a specific gravity greater than 10 means the substance will not be able to float on water since it is much heavier relative to water. For a substance to float, its specific gravity should be less than 10.

Specific gravities less than or equal to 10 indicate that the substance is either equal to or less dense than water, leading to buoyancy. This means that options stating a requirement greater than 10 are not appropriate for a substance to float on water. In buoyancy considerations, understanding the density and how it relates to water is crucial, and correct assessments of specific gravity help clarify the floating aspect of substances.