That is the correct scansion for that line - the poem is written in dactylic hexameter - and the stressed and unstressed syllables don't alternate. The patterns of stressed and unstressed syllables alternate, but in this case, the pattern is X / /, not X / or / X. The best guideline is to say the line normally and be patient.
An isobar refers to all of the nuclides of all elements that have a particular atomic mass. For example, helium-6 is one of the many isotopes of helium. The isobars of helium-6 are hydrogen-6, lithium-6, beryllium-6, and boron-6.
the force exerted by air molecules over a given area. air pressure. lines of equal pressure. isobars. the force which balances the vertical pressure gradient force and prevents the atmosphere around the earth from rushing off into space. gravity. instrument that usually consists of three or more cups. anemometer.