Bel is rarely used alone; its decimal subdivision 'decibel' is more common for measuring sound. Her piano playing peaked at 70 decibels, not bels.
Pro Tip 2/3
Technical Context
Use 'bel' in technical or scientific discussions about acoustics or electronics. The signal-to-noise ratio is often measured in bels.
Pro Tip 3/3
Practical Scale
Understand 'bel' as a logarithmic scale; each increase of 1 bel means a sound is ten times louder. A rock concert can be 3 to 4 bels louder than a vacuum cleaner.