The hot and cold notes on a bell lyre are typically used as a reference point to help tune the instrument. The hot notes are the notes that are sharp or higher in pitch, while the cold notes are flat or lower in pitch. By comparing the pitches of the notes played on the bell lyre to these reference points, a musician can adjust the tuning as needed.
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Air moves from hot to cold.
Heat flows from hot to cold.
The process being referred to involves a change from hot to cold.
Water can be either hot or cold depending on the temperature. Water at room temperature is considered neither hot nor cold.
Cold is to hot as still is to moving.