pressure node

In physics, a pressure node is a point within a standing wave where the variation in pressure is at its minimum, meaning the pressure remains constant. This is in contrast to a pressure antinode, where the pressure variation is at its maximum.1

Standing waves occur when two identical waves travel in opposite directions. In air columns, these waves can be visualized as having alternating nodes and antinodes. While illustrations often depict displacement or velocity, it's important to note that pressure nodes and antinodes are reversed in these representations. A pressure node corresponds to a displacement or velocity antinode, and vice versa. A pressure wave itself is a disturbance that propagates as a variation of pressure within a material medium, such as a sound wave.12