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Chemistry Videos 44 videos

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Chemistry: 2.5 Measuring in Metrics 189 Views


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Description:

Honestly, though. How seriously can you take the metric system when it measures things in moles? How heavy is a standard mole? How do you keep it from digging away? 

Language:
English Language

Transcript

00:00

sweetie didn't we have some bad news for you people living in the good old US of

00:08

A well we're weird house elves only [USA holding scroll of parchment]

00:12

measure things with little measurements like pounds and yards and miles and

00:16

bunches well they're silly because they don't make a lot of sense there are 36 [Gorilla grabs a bunch of bananas]

00:21

inches in a yard 1,760 yards in a mile 5,280 feet in a mile and how's anyone

00:29

supposed to remember all that nonsense but with the metric system there are 10

00:34

decimeters in a meter 10 centimeters in a decimeter and 10 millimeters in a

00:40

centimeter you feel in a sudden sense of calm walking over you yeah now that [Man standing on beach front]

00:45

would become associated with a rational orderly system of measurements and not

00:50

only does it make more sense but it's the system's measurement used all over

00:54

the world like we know it's cool to be different in all budgets sure would be [Gothic man walks by]

01:00

nice to be able to communicate with scientists in other countries than have

01:02

them understand what the heck we're talking about because this system of

01:05

unit they're so international it's actually called the International System [units of scientific measurements appear]

01:10

of Units 2x lever sublimating there you didn't see that one coming

01:15

well we call it SI for short and it's made up of a number of base unit that

01:19

can be used to measure all sorts of things including mass volume temperature

01:22

time and mold does not however measure athletic ability that's the other SI so [Man running on track]

01:27

let's go through the main base quantities real quick since you'll be

01:31

living eating and breathing these things for the rest of your chemistry career if [Woman sneezes while on the phone]

01:35

you're trying to measure the weight of something well you use kilograms created

01:39

by kg not to be confused with kilograms who are dangerous little old ladies like

01:45

to hang out in alleyways are to be avoided at all cost [Boy in alleyway and elderly woman holding a knife]

01:48

if measuring volume you'll use liter abbreviated by L yeah those soda

01:55

companies are already ahead of the curve if measuring time you'll use the second

02:00

abbreviated by s well okay at least we got something right for temperature [Man shrugs shoulders]

02:05

you'll be called upon to measure using kelvins abbreviated by K as a capital K

02:11

let's not insult this Kelvin fella making it lowercase and is measuring the [Kelvin appears]

02:15

amount of some substance you'll use the mole abbreviated mo L and it's not a

02:21

rodent the other thing you'll want to commit memory are the metric prefixes [Metric prefixes table appears]

02:26

these prefixes can be used with any SI unit although in practice we don't

02:30

really use them for temperature time or moles because we're not dealing with

02:33

extremely large or small numbers with those types of measurement unless you [Man running on track]

02:38

like to get your time measurements into a fraction of a nanosecond one tenth of

02:42

a regular unit is represented by the prefix deci so 1/10 of a meter is a

02:48

depth d meter one tenth of a liter is a deciliter and if you were normative one

02:54

hundredth of a unit is a send tip and one thousand is a milla going in the

03:00

other direction ten times a regular unit is deca as instead kamut ER or dekaliter

03:06

well 100 times is hecto and a thousand times is kilo like kilometer or Silla

03:13

leader so ya memorize those prefixes and you'll be good to go just don't ever [List of prefixes appear]

03:17

actually utter the words kill a pound so get laughed out of the lab and I'll [Scientists appear in a lab]

03:21

never be able to show your face again I'm assigning to the community

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