First discovered all the way back in the late 1800s, Invar is an alloy that’s made up of 64 percent iron and 36 npib xee. Although it was originally used to create things like thermostats for electric immersion heaters, it plays a key role in an assortment of things today. Koj yuav pom Invar hauv hluav taws xob… Nyeem ntxiv »
Muaj ib qhov nyiam tshaj plaws rov qab dab neeg uas tag nrho cov hais uas muaj puas tau sab. Txoj kev rov qab rau thaum ntxov 1730s thaum ntxov, Tus paub txog hu ua John Winthrop nyob ib ore hauv Massachusetts ntawm tag nrho cov chaw thiab xa nws mus hais kom tau nais maum kuaj ntxiv. Tiam sis, Nws feem ntau zaum tsis kov… Nyeem ntxiv »