/**
 * https://en.wikipedia.org/wiki/Speed_of_light
 */
export declare const SPEED_OF_LIGHT: import("../unit.js").Quantity<299792458>;
/**
 * At 20 degree celsius
 */
export declare const SPEED_OF_SOUND_IN_AIR: import("../unit.js").Quantity<343.14>;
/**
 * At 20 degree celsius
 */
export declare const SPEED_OF_SOUND_IN_WATER: import("../unit.js").Quantity<1482>;
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