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Sound Is Pressure Waves
- Sound is a pressure wave where energy moves through air without the air itself moving much.
- Vibrations bump molecules, creating cascades that reach our ears as sound.
Hertz Defines Our Hearing Range
- Sound frequency is measured in hertz, indicating wave repetitions per second.
- Humans hear between 20 Hz and 20,000 Hz, which defines the podcast's name, "Twenty Thousand Hertz."
Animals Hear Different Frequencies
- Different animals hear different frequency ranges; dogs hear up to 40,000 Hz while elephants hear lower frequencies.
- Low frequencies travel farther through mediums like water, aiding long-distance animal communication.