Expansion will result in an increase in a body's surface as well as its ________________.

When a substance undergoes expansion, it typically increases in both surface area and volume. Expansion refers to the physical process where an object or substance increases its dimensions in response to changes in temperature, pressure, or other conditions.

As a solid, liquid, or gas expands, the molecular structure tends to spread apart, resulting in an increase in the amount of space that the substance occupies. This increase in volume is a fundamental characteristic of expansion, whether it’s thermal (due to heating) or due to a decrease in external pressure.

Understanding expansion is crucial, particularly in power engineering, as it affects various systems such as boilers and heat exchangers. When systems are designed, engineers must account for the changes in volume that can occur to prevent structural damage or failures due to excessive pressure or faulty operation.

Options such as temperature and pressure relate to conditions that might cause expansion but are not direct results of the expansion itself. Coefficient, in a general context, does not pertain directly to the physical increase of the body in question. Therefore, the most appropriate and relevant outcome of a body’s expansion is its increase in volume.