flux

"The 100-Year Life" を読んでいます。 次の文は 'Working' の章からの引用です。

A moment's reflection on these changes makes it obvious that being able to forecast developments for the centenarians born today is nonsensical. Dealing with this uncertainty will be a major part of living a long life. Those who live longer - assuming the pace of change will not alter - will experience a great deal more flux than past generations. If, as many technologists claim, the pace of change is increasing, then their experience of flux will be even more profound.

"magnetic flux" は知っていますが、 それではここの "flux" の意味とは関係がなさそうです。　辞書を見ます。

・Oxford English Dictionary: continuous movement and change: Our society is in a state of flux.
・Collins Dictionary: If something is in a state of flux, it is constantly changing.: Education remains in a state of flux which will take some time to settle down.
・Cambridge English Dictionary: continuous change: Our plans are in a state of flux at the moment.

次のVocabulary.comの説明を読むと、 "flux" は元々流動体の流れを意味していたので、流動体は常に変化しているので、変化の意味にもなったことが分かります。

The noun flux describes something that constantly changes. If your likes, dislikes, attitudes, dreams, and even friends are changing all the time, you may be in flux.
Flux can also mean being unsure about a decision. Suppose you just had a great job interview and suddenly your friend invites you to go to Australia with her. You don't know what to do because you don't want to miss a call about the job — or Sydney! You're in flux until you hear from the potential employer. Another kind of flux is liquid moving or flowing, like the flux of water under a sheet of melting ice.