fluid. n. 1. (General Physics) a substance, such as a liquid or gas, that can flow, has no fixed shape, and offers little resistance to an external stress. adj. 2. (General Physics) capable of flowing and easily changing shape.
The thermosphere layer. The thermosphere layer is called the thermal layer as it is the hottest layer of the atmospheric envelope . It is the fourth layer of the atmospheric envelope, The temperature of the thermosphere layer increases with a high rate as we go up until it reaches 1200 degree Celsius
(3) In the mesosphere, the air is relatively mixed together, so the temperature decreases with altitude. The atmosphere reaches its coldest temperature of around -90Â°C in the mesosphere. This is also the layer in which a lot of meteors burn up while entering the Earth's atmosphere.(4) The thermosphere is the fourth layer of the Earth's atmosphere.The air is really thin in the thermosphere.A small change in energy can cause a large change in temperature. That's why the temperature is very sensitive to solar activity.4) The thermosphere is the fourth layer of the Earth's atmosphere. The air is really thin in the thermosphere. A small change in energy can cause a large change in temperature. That's why the temperature is very sensitive to solar activity.