Isotherms on weather maps are drawn for every even 10 deg.
Draw a few other isothermsparallel to the first, and each one representing a temperature 10 deg.
Diminish and increase the number of isotherms on your map, as suggested in the preceding example, making temperature forecasts in each case, and comparing the three sets of forecasts.
Also gives isobars and isotherms and a forecast for the month succeeding the date of publication, and a review of the weather over the oceans for the preceding month.
Count the number of latitude degrees on your scale between the isotherms of 10 deg.
During our winter months the isotherms are a good deal closer together than they are during the summer, or, in more technical language, the temperature gradient between the equator and the North Pole is steeper in winter than in summer.
Two isotherms cannot cross one another, for if they did you would have two temperatures, differing by 10 deg.
Select, on any weather map, some station lying between two isotherms at which you wish to measure the rate of temperature decrease.
Footnote 3: Unless the isotherms are exactly parallel, the scale cannot be at right angles to both of them.
Now draw twice as many isotherms on your map as you had in the first place, still letting these lines represent differences of temperature of 10 deg.
Divide the number of degrees of difference of temperature between the isotherms (always 10 deg.
Trace off the isotherms which are near the center of low pressure.
The temperate zones merge into the polar zones at the Arctic and Antarctic circles, or, if temperature be used as the basis of classification, at the isotherms of 50 deg.
Hence it has been suggested that the zones be limited by isotherms rather than by parallels of latitude, and that a closer approach be thus made to the actual conditions of climate.
It must not be supposed that the isotherms in the antarctic region run parallel with the latitude lines.
On the west coasts of the north temperate lands the isotherms are far apart.
The classification of the zones on the basis of the distribution of sunshine serves very well for purposes of simple description, but a glance at any isothermal chart shows that the isotherms do not coincide with the latitude lines.
Isotherms are other such cleavage lines, marking the limits beyond which an aggressive people did not desire to expand because of an uncongenial climate.
In these the isothermsfor every second degree are drawn in broken lines.
These undulating curves of the isotherms and isohalins are familiar to us in the Norwegian Sea, where they have been shown in most sections taken in recent years.
We see from the sections how nearly the isotherms and isohalins follow each other.
We see further in both sections, and especially in the southern one, that the isotherms and isohalins often have an undulating course, since the conditions at one station may be different from those at the neighbouring stations.
This state of things is clearly apparent in the sections, where the isotherms and isohalins run vertically for some way below the surface.
The relative values supposed, however, are near enough to illustrate the contention that the type of the maximum volume curve can be explained on this assumption of different adsorption isotherms for each of the ions.
If these hypothetical adsorptionisotherms be plotted as usual we get the fairly typical curves shown in Fig.
The theory of this circulation from the Polar seas is greatly strengthened by the facts appearing from the investigation of the bathymetric isotherms in inclosed seas, i.
On looking at the isotherms for the year it will be observed that the average temperature of Italy and Spain is ten degrees higher than the average temperature of England.
According to the isotherms for the year the Victorians live in an atmosphere between eight and ten degrees hotter than our own.
Isotherms in dotted black lines for each ten degrees Fahr.
In summer the isotherms are almost reversed in position, at least as far as the land is concerned, for they bend to the north in the heart of the continent.
The irregular course of the isotherms is due to many causes.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "isotherms" in a variety of sentences. We hope that you will now be able to make sentences using this word.
