When an object moves through a medium like air or water, it can create disturbances in the surrounding medium. Whether these disturbances generate a compression wave (sound) or not depends on the speed at which the object moves compared to the speed of sound in that particular medium.
In general, when an object moves through a medium at a speed greater than the speed of sound in that medium, it creates a compression wave known as a sonic boom. This occurs because the object is displacing the particles of the medium faster than the speed at which the disturbances can propagate, causing them to accumulate and create a shock wave.
In the case of air, the speed of sound is relatively low compared to the speeds of many objects we encounter. For example, the speed of sound in dry air at sea level is approximately 343 meters per second (or around 767 miles per hour). If an object, such as an airplane or a bullet, moves through the air at a speed greater than the speed of sound, it will generate a compression wave or sonic boom.
On the other hand, when an object moves through a liquid like water, the speed of sound is significantly higher compared to air. In water, the speed of sound is approximately 1,500 meters per second (or around 3,355 miles per hour), which is much faster than the typical speeds of objects we encounter in water. Therefore, it is less likely for an object to move through water at a speed greater than the speed of sound in water, and thus, the generation of a compression wave or sound is less common.
However, it's important to note that objects moving through water can still create disturbances in the form of pressure waves, albeit they may not be as noticeable or classified as traditional "sound waves." These pressure waves can propagate through the water and have effects on the surrounding environment, but they may not be perceived as sound in the same way we experience it in the air.