The reason you are seeing this test, rather than smelling it, tasting it, or hearing it, is because your visual receptors are being stimulated and the information is being sent along the optic nerve to the occipital lobe in your brain. This process is called .

Coding

Explanation:

Coding is defined as the overall process where the visualizing receptors are stimulated, and the information generated is thereby sent along the optical nerve towards the occipital lobe in the brain of a human being. This test can be observed without the involvement of tasting, smelling or hearing it.

In simple word, coding refers to the group of signals that are commonly used for the purpose of communication.

uses : -

1.aneroid barometers primarily measure whether pressure is rising or falling.

2.aneroid barometers are often used for reading pressure in homes and recreational boats.  

3.other uses may include barographs in meteorology and altimeters in modern aircraft.  

4.this type of barometer can announce whether a high or low pressure system is coming or whether it is becoming more intense.  

5.there are different types of aneroid barometers, such as the altimeter, which measures altitude, or distance above sea level.  

6.another example is a barograph, which is a modified aneroid barometer that provides constant readings of atmospheric pressure on graph paper.  

7.when used in this capacity, the aneroid barometer can store a week's worth of data.

android diameter a device for measuring atmospheric pressure , often specially calibrated for use as an altimeter ,consisting of a box or chamber partially exhaused of air, having an elastic top and a pointer to indicate the degree of compression of the top caused by the external air

refer to the attachment for the characteristics : -