“gas molecules in a near-vacuum”

The expression "gas molecules in a near-vacuum" gives physical form to the isolation Ish imagines after the disaster: survivors may exist, yet remain unable to make contact. Its later echo, as isolated people begin to find one another, complicates the image without simply undoing it; proximity and survival do not by themselves restore a sustaining social world.

First Use: Survival Without Contact

As Ish watches a sign still flashing over the empty world, he weighs whether he should consider suicide. He rejects the thought as premature because other people may still be alive, but imagines them as molecules circulating through a near-vacuum, each unable to reach another. The comparison holds together two conditions: life continues, but connection seems vanishingly unlikely. His uncertainty is not only about finding other survivors; it extends to whether human presence can still amount to a life worth living amid the remains of civilization.

The Image Returns on the Road

Later, traveling west through Indiana, Illinois, and Iowa, Ish encounters people more often in pairs or groups of three. The narrative revisits the earlier metaphor in a changed tense and direction: "The isolated molecules were beginning to find one another." The phrase marks a real movement from imagined, absolute separation toward contact. Yet these small groups generally cling to places they knew before the disaster, and none wants to leave with Ish, even when some invite him to stay.

Contact and Its Limits

The later encounters distinguish physical association from emotional recovery. Ish recognizes that these survivors are physically alive but seem to inhabit a kind of emotional death. He understands the damage as a consequence of losing the culture-pattern that organized everyday existence: family, work, friends, church, customary amusements and routines, and hope. In that context, the molecules' meeting is significant but not a cure. The expression traces a shift from loneliness as the absence of other people to a harsher recognition that people can find one another and still remain cut off from the structures that made connection meaningful.