Question

What do isobars indicate?
(A) The atmospheric pressure in a particular area
(B) Rainfall in different places
(C) Wind strengths in several areas
(D) Places with the same temperature

Answer 1

Hint: There is a mapping technique that can assist meteorologists in predicting the passage of the wind and perhaps other variations in the atmosphere. This device is known as an isobar. Isobars are abstract lines drawn from one location to another depending on some common aspect. Isobars are typically constructed at two to four millibar intervals (also denoted as one-thousandth of a bar).

Complete answer:
On weather charts, isobars are the figurative lines that link points with equivalent atmospheric pressure. Isobars are designed in such a way that the lines never overlap each other. Also, note that isobars are similar to the lines indicating height on a map. Data from average pressure at the sea-level surveys are being used to design these lines. Meteorologists employ isobars on weather charts or maps to represent air pressure variations over time and to forecast wind movement.

We can examine each option one by one:
Option (A) ‘the atmospheric pressure in a particular area’ is the correct option. Isobars can be seen on charts that depict the general weather conditions. Isobars indicate the values of air pressure or atmospheric pressure in the indicated area. When the isobars are nearer, they indicate whether that is stormy or windy, on the other hand, if they are wider apart, they display the presence of calm weather.
Option (B) ‘rainfall in different places’ is an incorrect option. This is because isobars have an important function in notifying the movements of wind and air pressure but do not associate with rainfall. Rainfall is not indicated by any isobars hence we can say that this option is irrelevant.
Option (C) ‘wind strengths in several areas’ is an incorrect option. Even though isobars can predict wind movement, they do not indicate the general strength of the wind. The strength is associated indirectly with atmospheric pressure, but isobars can only plot the pressure variation and it cannot show the wind strength. This option is wrong.
Option (D) ‘places with the same temperature’ is an incorrect option. There is another term we use to indicate the places which experience equal temperatures, such indications are done by isotherms. Here we require the use of isobars, but since equal temperatures are denoted by isotherm, this option can be rejected.

Therefore the correct answer is clearly option (A) ‘the atmospheric pressure in a particular area’.

Note: Isobars can create some trends that can be used for weather prediction or forecasting. A region that experiences low pressure is defined by open isobars forming a V-shape, whereas an area of high pressure is defined by N-shaped open isobars.