It is because a surface area is a two-dimensional concept. Two linear dimensions and so squared units,.
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Surface area is a two-dimensional measurement that only accounts for the external dimensions of an object, so it is measured in square units (e.g., square meters, square inches). In contrast, volume is a three-dimensional measurement that represents the space occupied by an object, so it is measured in cubic units (e.g., cubic meters, cubic inches).
The measure of the size of the surface of an object or region is its area. Area is typically measured in square units such as square meters or square feet.
Small volumes of liquid are typically measured in units like milliliters (mL) or cubic centimeters (cm^3). These units are commonly used in laboratory settings and in everyday measuring tasks.
The amount of space a physical object occupies can be measured by its volume. Volume is the three-dimensional space that an object occupies, and it is typically measured in cubic units such as cubic meters or cubic centimeters.
Pressure is typically measured in units such as Pascals (Pa), atmospheres (atm), or pounds per square inch (psi). Force is measured in units such as Newtons (N) or pounds (lbs), and area is measured in units such as square meters (m^2) or square inches (in^2).
The amount of space that a material occupies is called its volume. This can be measured in cubic units, such as cubic centimeters or cubic meters, depending on the scale of the material being measured.