Consider a low-speed subsonic wind tunnel with a nozzle contraction ratio of 1 : 20. one side of a mercury manometer is connected to the settling chamber and the other side to the test section. the pressure and temperature in the test section problems 281 are 1 atm and 300 k, respectively. what is the height difference between the two columns of mercury when the test section velocity is 80 m/s?

Isobars are lines of constant or equal pressure on a weather map. they can be used to find areas of low or high pressure over a broad area, and they can tell us how intense the system may be. on weather maps, you may have noticed areas that have a large l or h over a region with lines circling around them. the l stands for low pressure and h stands for high pressure. the lines circling them are isobars. check out the pressure system and isobars over georgia and florida. what is the present weather in this area ? a) clear and sunny b) cold and cloudy c) changing weather d) lots of precipitation