It means that the amplitude of the soundwaves is increased, or is increasing if the sound continues to get louder.
Amplitude = "Loudness" In that a direct increase in amplitude will cause the sound to be "louder".
The two properties of a sound that get louder are its amplitude, which determines the volume or intensity of the sound, and its energy level, which increases as the sound becomes louder.
the sound gets louder
The amplitude (The height of the wave) of the wave increases as the sound gets louder.
It gets louder or quieter.
when the dowsing machine bleeps it means u r near a hidden item the closer u get the louder/faster the sound gets
If it gets faster and louder when you rev the engine it might be a lifter in your valve train. Not hearing it i don't totally know.
It gets louder and then gets quieter
As sound gets louder, the ear drum vibrates more forcefully. If the sound is extremely loud, the ear drum may reach its maximum vibration capacity, leading to potential damage or tearing. This can result in hearing loss or other ear-related issues.
baffles corrode, filling shrinks and gets pulverised, so the sound gets louder, and back-pressure drops. in short, it's wear-n-tear.
sounds like a bad cv axle