Step-by-step explanation:
The first picture is of hygrometer.
Hygrometer, instrument used in meteorological science to measure the humidity, or amount of water vapour in the air.
Hygrometer works on the phenomenon called evaporative cooling. When water evaporates from any surface, it becomes cool because water molecules take heat energy from the surface during the evaporation. Due to this cooling effect wet bulb always shows low temperature than the dry bulb.
The second picture is of thermometer.
Thermometer for measuring air and sea surface temperature.
A thermometer has a glass tube sealed at both ends and is partly filled with a liquid like mercury or alcohol. As the temperature around the thermometer's bulb heats up, the liquid rises in the glass tube. The glass tube is mounted on a backboard that is marked in units called degrees.
The third picture is of barometer.
Barometer for measuring atmospheric pressure.
The barometer works by balancing the mercury in the glass tube against the outside air pressure, just like a set of scales. As air pressure increases—that is, as the air becomes heavier—it pushes more of the mercury up into the tube. ... So the level of mercury in the tube provides a precise measure of air pressure.
Importance of weather forecasting:-
Systematic weather records play an effective role in various professions, particularly for agriculture and businesses that are dependent on it. Agricultural processes like planting and harvesting can be planned better and carried out more efficiently if long-term weather patterns can be estimated.
On the other hand, Airlines is another region where weather plays a vital role. They need to recognise the local weather conditions in order to schedule flights. Weather forecasting helps them make perfect daily decisions, and may even help keep us out of danger.