A1: In practice, the USB specification limits the length of a cable between full speed devices to 5 meters (a little under 16 feet 5 inches). For a low speed device the limit is 3 meters (9 feet 10 inches). Q2: Why can't I use a cable longer than 3 or 5m?
Clouds form when moist, warm rising air cools and expands in the atmosphere. The water vapor in the air condenses to form tiny water droplets which are the basis of clouds.
Clouds are made up of tiny droplets or frozen crystals of water. 1  High-High level clouds form above 20,000 feet. 2  Because it is colder higher up, these clouds are mostly made of ice crystals. 3  High level clouds usually have the prefix cirro or cirrus in their name.