Because air pressure is basically the same indoors and out, a barometer can be placed inside or outside. For home use, hang a barometer on a wall in a place where people can read it conveniently. In most cases, this is an indoor wall , but outdoor walls work, too. Can I take a barometer on a plane?
Don't try to take your barometer with you on an airplane, no matter what the seller tells you. All airlines have very stringent regulations about hazardous materials, and mercury is high on their list. Are barometers accurate? Most common barometers on the market are not accurate enough to serve this purpose.
They are more decorative than functional. Barometer vs. A barometer displays the present pressure and the change of pressure since it was last set using a marker hand on the dial. Can a barometer work indoors?
Barometer does not care where it is. It measures ambient pressure, indoors or outdoors. Since barometric pressure is significantly affected by altitude and to a lesser extent, changes in weather , the barometer must be calibrated to sea-level to offset altitude effects. If your altitude exceeds the measurement range of the sensor mechanism, the barometer can not be adjusted to compensate for your altitude effects.
You will need to purchase a barometer that is designed for higher altitude conditions. Also Consider Relative barometric pressure does not match official source. Shop Best Sellers.
Home News. Previous Next. To read your Barometer you need to do the following: 1. The hectopascal is the international meteorological unit of pressure. Patterns and Effects It is interesting to note that owing to the daily atmospheric tide effect, the pressure will normally fall by about three hectopascals between 9am and 3 pm and will rise by about 3pm and 9am. When is the best time? Related Blog Posts. Feedback from an Avid Boatie looking for a Barometer and Clock. Best Barometer or weatherstation to buy in Australia Edit this Article.
We use cookies to make wikiHow great. By using our site, you agree to our cookie policy. Cookie Settings. Learn why people trust wikiHow. Download Article Explore this Article parts. Related Articles. Article Summary. Part 1. Buy a barometer. There are 3 types of barometers that can be purchased. If you own an antique barometer, then is most likely mercury or aneroid.
Aneroid or electronic barometers are more commonly available for purchase. Before purchasing a barometer, check its altitude usage.
Not all barometers function properly at high altitudes so buy one that can specifically be used at altitude if you live high above sea level. Here are some brief descriptions of each type of barometer: [2] X Research source Mercury: The mercury barometer, sometimes called a stick barometer, was the first to be invented. It uses an open tube system with a pool of mercury that rises and falls with pressure changes.
They only work at an altitude up to 1, feet. It uses a small box made from beryllium and copper that expands or contracts based on pressure changes. These motions cause mechanical hands to move pointing towards the current air pressure. Electronic: Electronic barometers are a little more complicated to understand, but they employ sensors and strain gauges that cause changes in voltage that can be converted to a display of pressure for the user.
Obtain a local reading of barometric pressure. If using an aneroid barometer, you will need to calibrate it to your location. Listen to a local weather forecast to find the current barometer pressure for your location. Make sure the reading is correct for your location. Even a few miles can affect a barometer reading. Setting your barometer to your location will take into account differences in pressure caused by the altitude of your location.
The factory setting for aneroid barometers is at sea level, but if you don't live at sea level, you will need to calibrate it. Set the indicator hand on your barometer. Locate the small adjusting screw on the back of your barometer. With a small screwdriver, turn the adjusting screw to move the hand to your location's current pressure.
Watch the face of the dial and stop turning the screwdriver when the hand reaches the appropriate reading. If you are using a mercury barometer, you will have to use a conversion for your readings. Digital barometers have sensors to calibrate altitude automatically. Hang the barometer in a location that works for you. It makes no difference whether the barometer is hung on an inside or an outside wall.
The pressure will be the same both indoors and outdoors. Well-sealed and air-conditioned rooms are not as affected by changes in air pressure, so avoid these rooms if possible. Avoid a location that is exposed to direct sunlight as the temperature changes can affect the readings. Hang the barometer away from drafty locations, like near a door or a window. Air pressure is too variable in these locations. Check occasionally to be sure that your barometer works properly.
If you suspect inaccurate readings, you can check your barometer with an easy trick. With the barometer hanging on the wall, slowly slide the bottom of it sideways to a degree angle. The tube should fill with mercury.
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