If you're thinking about buying one of these vehicles, you should be aware that the average yearly cost to insure one is $1,966.82, and BMW autos are ranked 30th out of 36 in terms of insurance rates.n the scheme of things, these automobiles are expensive. That's not true when stacked up against Rolls-Royces and the like, but it's true when comparing BMWs to many other cars. The 1-Series, for example, has a starting MSRP of $31,200. The M3 coupe, on the other hand, has a starting MSRP of $60,100.
How Hygrometers Work. Hygrometers work in different ways depending on the application or purpose for testing moisture content in the air. The simplest type of hygrometer uses human hair, which causes strands to expand or contract to move a needle. The most common type of hygrometer, which is called a psychrometer, uses two thermometers: one with a wet bulb and one with a dry bulb. Temperatures drop as moisture evaporates from the wet bulb, and the relative humidity is determined by comparing the temperature differences between the two thermometers.
These hygrometers used physical moving parts to measure moisture content and were, therefore, quite inaccurate. Other types of hygrometers have used human or animal hair, wet and dry thermometers, and even mirrored surfaces to measure the dew point.