Uniamo le menti esistenti

in combinazioni nuove che siano utili, forse.

Un bel bagno nell’idrogeno liquido

Nel caso ve lo foste sempre domandato: no, immergere una mano nell’idrogeno liquido non ne causa automaticmaente la perdita. Mike Walker ci ha provato e ha sperimentato come per i primi secondi, una naturale pellicola di notrogeno abbia protetto i suoi tessuti dall’ibernazione.

My skin didn’t get hurt for the same reason that water droplets dance on a hot skillet. An insulating layer of steam forms almost instantly between the water and the metal, keeping the droplets relatively cool as they float for several seconds without actually touching the hot surface. To liquid nitrogen, flesh is like that skillet—a surface hundreds of degrees above its boiling point. So the moment my hand touched the liquid, it created a protective layer of evaporated nitrogen gas, just as the skillet created a layer of steam. That gave me just enough time to put my hand in and pull it out again. Any longer than that, and frostbite would have set in. The phenomenon is called the Leidenfrost effect (after Johann Gottlob Leidenfrost, the doctor who first studied it in 1756). I’d known about it for years, but when it came time to test it in real life, I have to admit that I used my left hand, the one I’d miss less. Do not try this. If liquid nitrogen soaks into your clothes, you will not be protected by the Leidenfrost effect, and you can get frostbite very quickly.

link


Any longer than that, and frostbite would have set in. The phenomenon is called the Leidenfrost effect (after Johann Gottlob Leidenfrost, the doctor who first studied it in 1756). I’d known about it for years, but when it came time to test it in real life, I have to admit that I used my left hand, the one I’d miss less.

Lascia un commento

Inserisci i tuoi dati qui sotto o clicca su un'icona per effettuare l'accesso:

Logo WordPress.com

Stai commentando usando il tuo account WordPress.com. Chiudi sessione / Modifica )

Foto Twitter

Stai commentando usando il tuo account Twitter. Chiudi sessione / Modifica )

Foto di Facebook

Stai commentando usando il tuo account Facebook. Chiudi sessione / Modifica )

Google+ photo

Stai commentando usando il tuo account Google+. Chiudi sessione / Modifica )

Connessione a %s...

Informazione

Questa voce è stata pubblicata il agosto 31, 2010 da in curiosità.

Che ci frulla in Twitter?

Errore: Twitter non ha risposto. Aspetta qualche minuto e aggiorna la pagina.

Categorie

%d blogger cliccano Mi Piace per questo: