The usefulness is clear if we think to the possible danger to our modem or router due to the overload caused by a lightning fallen too much near us; this widget helps to understand when the thunderstorm is approaching and it's time to pull the plug from the modem. The speed of sound depends on the air temperature: for this reason, we can insert it in the preferences; on the same back, we can also choose the temperature scale and the distance measurement unit.
If we change the units, the data that are already present will be coverted; we can select meters, kilometers, yards, miles, nautical miles and foot while the temperature can be expressed in Celsius, Farenheit degrees or Kelvin.
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