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.
That's because clouds are composeâ¦d of water droplets - liquid water, or water ice - tiny ice crystals. Either way, clouds are not invisible water vapor. Clouds can form as water vapor condenses to form tiny droplets of liquid water. These droplets can come together - coalesce - to form larger droplets. You've seen fog. Fog is a cloud at ground level. And if you've seen fog, then you've seen that clouds are composed of tiny water droplets suspended in air.