Isobars are lines joining places having equal
(1) Rainfall
(2) Pressure
(3) Population
(4) Height above sea-level
Answer: (2) An isobar is a line of equal or constant pressure on a graph, plot, or map; an isopleth or contour line of pressure. More accurately, isobars are lines drawn on a map joining places of equal average atmospheric pressure reduced to sea level for a specified period of time. In meteorology, the barometric pressures shown are reduced to sea level, not the surface pressures at the map locations. The distribution of isobars is closely related to the magnitude and direction of the wind field and can be used to predict future weather patterns.
