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Chemistry Videos 44 videos

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Chemistry: 4.9 Walk the Planck 58 Views


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Description:

Yarr, we be talkin' about Planck's constant today. It doesn't actually have anything to do with pirates, but we'll take the opportunity to talk like one whenever we get it.

Language:
English Language

Transcript

00:04

Only a handful of

00:05

individuals in recorded history have

00:07

been lucky enough to have their own [Man wearing prison clothing]

00:09

number. Avogadro has one. So do you Euler, Newton, and Hubble.

00:15

And don't forget about

00:16

Nathaniel fifteen, and we're sure you've all

00:19

heard of that one. Yet another scientific

00:21

brainiac to lay claim to a number of

00:23

his very own was German theoretical

00:26

physicist and life of every party Max [Max Planck wearing a party hat]

00:29

Carl Ernst Ludwig Planck. This guy had

00:33

almost as many brilliant ideas floating

00:35

around in his head as he had middle names.

00:37

Planck's Constant, the number that

00:39

totally put him on the map,

00:40

is 6.6262 x 10 to the -34 joule-seconds. [Plancks constant example]

00:46

We have to admit, that it's an awfully good number.

00:49

But what is this mysterious number and

00:52

what's so special about it? And what in

00:53

the name of all that is good and holy is

00:55

a joule-second? Yeah, we hear your cry. A joule-second

00:59

is not part of a diamond-encrusted wristwatch, although [Diamond wrist watch ticks]

01:02

if you'd like to get us one of those as a "thank you"

01:04

for teaching you about Max Planck,

01:06

well, we won't complain. All right, let's

01:08

break it down. A joule is a unit for [Definition of joule unit]

01:10

measuring energy, and a second is one-

01:13

sixtieth of a minute (you know, you knew

01:16

that one), so a jewel second is a unit of

01:19

energy over a certain span of time. Like

01:23

any great scientific constant worth its

01:25

salt, Planck's Constant is also

01:27

represented by a single letter in the

01:29

interest of simplicity. You can just [Planck's constant with the alphabet]

01:31

write the letter h instead of writing

01:33

out the entire thing. The alphabet says

01:36

"You're welcome." Okay, now what is this thing, and

01:38

why does it deserve take up valuable [Man's head opens and words go into his brain]

01:40

space in our brains? Well, in the course of

01:42

Planck's experiments, in which he was

01:44

trying to understand a little more about

01:46

atomic theory (in particular the question

01:48

of whether or not there is a continuous

01:50

fluid spectrum of energy), what Planck

01:52

discovered was that, no: energy was [Energy, Frequency and Velocity drinking coffee together]

01:55

something of an oddball in that department.

01:57

He proposed that energy instead came in

02:00

units called "quanta." Yep, the root of

02:03

the word quantum, which is the root of the

02:05

TV show title called Quantum Leap, which is [TV screen with the TV show Quantum Leap]

02:08

getting off topic... But Planck concluded

02:10

that the smallest possible unit of

02:11

energy was 6.62626 x 10 to the -34 joule-seconds,

02:16

and that's how he got himself his own number. If your're

02:19

feeling jealous of Mr. Planck and would

02:21

like a number yourself, well, 6.6262 x 10 to the -35 [Man holding news paper with Planck's constant on front page]

02:26

joule-seconds is totally available.

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