Unit Conversion & Significant Figures: Crash Course Chemistry #2

A unit is a frequently arbitrary designation we have given to something to convey a definite magnitude of a physical quantity and every quantity can be expressed in terms of the seven base units that are contained in the international system of units. Hank thinks this is a thrilling subject, and while you may not agree, it is a subject that is very important if you want to be a scientist and communicate with accuracy and precision with other scientists. So listen up and learn something or Hank might have to kill you! (NOT REALLY!)

Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!

Table of Contents
Unit Conversion 02:27
Scientific Notation 03:26
Sig Figs 07:40

Want to find Crash Course elsewhere on the internet?

[crashcourse]

Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!

[tiffanyfan]

Hank in 2013: "maybe 50-100k views"
2019: 2.7M views

[randomgaygirl]

I'll remember that next time when I fail my test: "At least you didn't fail your mission to Mars" lmao

[simplymaci]

"Do you know what we do to liars in Chemistry? We kill them" -Hank Green

Should've been my senior quote smh

[Ittybits]

You Crash Course guys should make a site that tests us on the information so we can see how much we are absorbing from each episode. (Yes, I'm that person that WANTS to test.) Thank ya'll and keep up the good work!

[mackthenavaja]

I swear Crash Course is the only reason I'm doing well in school

[Econcrafter]

"-And you know what we do with liars in chemistry? We kill them" -Hank, 2015

[kaitlyncarroll]

When you have a chemistry test tomorrow and you don't understand sig figs so much you use Hank to help

[jasonhurle]

5:26 Calculator says boobs.... very funny Hank.

[christianolivenciaco]

*tells a lie in chemistry class*
*remembers this video*

*starts sweating profusely*

[ljfleming]

50-100k views: Hank's prediction.
views: reality

[feritfox]

you have explained sig figs better then my teacher and i'm taking a summer class for chemistry. I'm awful at it. Thank you.

[rhaenareece]

Wait. Your name can be spelled with a lowercase letter. Green or green. Name or color. So you are a great person.

[zazakoolaid]

We don't kill liars in Chemistry... we Barium. Missed obvious joke opportunity.

[mariakal]

"50 to 100 thousand views"

*video has nearly 650 thousand views*
UPDATE: *video has nearly 2 mil views*

[BackwardAssassin]

This still bugs me. They added an annotation correcting the 310 error, but there's no annotation for the light years per second calculation. They got the completely wrong number for it! The correct answer should've been 2.8 x 10^-15 ly/sec, it is not 9.3 x 10^-12 ly/sec. *_It's been nearly 4 years now, how am I the only one that's noticed this!_*

[orangeburrito_]

"And do you know what we do with liars in chemistry? We kill them!"
-Hank Green 2013

[Mooseplatoon]

"You know what we do with liars in Chemistry? We kill them"- Hank Green, secretly a supervillain.

[itsmargaretxoxo]

"You know what we do with liars in chemistry?" 

WAS REALLY WAITING FOR YOU TO SAY "BARIUM" HANK
c'mon. oldest chemistry joke in the book. :p


but also, very good video! I've been watching your series all night. Thank you for teaching me in a way my chem professor couldn't. 

[xChibiAstralxX]

In chemistry, we kill liars by pouring strong acids on them, followed by titrating some bases on their bodies