In dry air at 20 C (68 F), the speed of sound is 343.2 metres per second (1,126 ft/s 1,236 km/h 768 mph 667 kn), or a kilometre in 2.914 s or a mile in 4.689 s. Calculator, Weather Reports, METAR, TAF, Wind Components, Instrument Simulator, Weight and Balance, Pressure Altitude, Density Altitude, True Air Speed. You should not deviate above 1200 or below 1100 feet per second. Speed Of Sound Calculator The speed of sound is the distance travelled per unit time by a sound wave as it propagates through an elastic medium. We know that the speed of sound is given by the formula: v Substituting the values in the equation, we get v 0.35 m × 2000 Hz 700 m/s The time taken by the sound wave to travel a distance of 1. If you wish, you can adjust the speed of sound to your preferences however, under most situations, our default should be used. So, for example, if you counted 30 seconds between the lightning and the thunder, you can estimate that the lightning was about 6 miles away, since 30 divided by 5 = 6.Įnter the number of seconds from the flash of lightning until you hear the start of the thunder rumble. This approximation will give you a good idea of how far away the lightning was. That is a little more than one mile per five seconds. Sound travels through air at about 1100 to 1200 feet per second (our default is 1150). The delay between when you see lightning and when you hear thunder occurs because sound travels much, much slower than light. The formula is to divide the number of seconds by the speed of sound in feet per second. Upon viewing a flash of lightning in the sky, count the number of seconds until you hear thunder. This calculator is designed to give the approximate distance from lightning, based on the speed of sound. This calculator requires the use of Javascript enabled and capable browsers.
Lightning Distance Calculator Lightning Distance Calculator
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