Why does heat cause a substance to expand? i. heat causes the substance's atoms or molecules to move faster. ii. the substance gets larger because it converts heat to mass. iii. heat drives water into the spaces between atoms or molecules.

Heat causes the substance's atoms or molecules to move faster.

Answer: buoyancy forceexplanation: in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.