the P wave
The word 'compress' is the opposite of 'expand'.
False. S waves (secondary waves) move through the ground by shearing the rock particles side to side, creating a horizontal motion that is perpendicular to their direction of travel. This shearing motion can cause the ground to move in a wave-like pattern, but not compress and then expand as with compressional waves (P waves).
The fastest waves that compress and expand the ground like an accordion are primary waves (P-waves). These seismic waves are the first to arrive after an earthquake and travel through solids, liquids, and gases. They cause particles in the ground to move in the same direction as the wave itself, resulting in the compressional and expansion effects.
The fastest waves shaking the ground like an accordeon (contraction and expansion) are the P waves. They have a global velocity of 5.5km/s in the crust while S waves moves at velocities around 3.2 km/s in the crust. Then you have surface waves (rayleigh and Love) which propagates only in the crust at velocities smaller than the S waves velocity.
Steel expands when heated because the heat causes the atoms within the steel to vibrate more, increasing the spacing between them. This expansion can be measured in terms of thermal expansion coefficients.
uncompress, expand, extend, stretch, increase
Longitudinal waves.
In a P-wave (primary wave), the ground moves back and forth in the direction of the wave propagation. This means that the particles in the ground compress and expand as the wave passes through them, creating a push-pull motion similar to a slinky being compressed and stretched.
An antonym for compress is expand. This means to make something larger or more spread out instead of making it smaller or more compact.
Try exerting pressure while turning clockwise to retract
Because they have to move to let your lungs expand and compress as you breathe in and out.
P Waves