A barometer is an instrument used to measure atmospheric pressure. A circle does not have a barometer!
Well, an aneroid barometer, is called an aneroid barometer- but, a barometer measures air pressure, and an aneroid barometer is a barometer that contains no liquid.
A mercury barometer.
its a circle with numbers in order to read/measure the atmospheric pressure a circle with numbers to measure the atmospheric pressure
It is called a barometer, first developed in the 1600's
An easily portable instrument used for measuring air pressure is called anedroid barometer.
Not sure about an insuement, but an instrument for measuring air pressure is a barometer.
it is called BAROMETER
A barometer.
"barometer"
To measure the local pressure of the Earth's atmosphere, Torricelli invented the first Mercury Barometer.
Usually the instrument used is called a barometer- which could be a closed end manometer or an aneroid barometer.An altimeter actually also measures atmospheric pressures - but for a different purpose.
The device is called a barometer.