A riser, also known as a feeder, is a reservoir built into a metal casting mold to prevent cavities due to shrinkage.
Most metals are less dense as a liquid than as a solid so castings shrink upon cooling, which can leave a void at the last point to solidify.
The purpose of a riser is to
Answer is:
feed the molten metal to the casting in order to compensate for the shrinkage
Explanation:
