Writing Volumes From Glassware

Writing Volumes

From Glassware

Numbers I n th is w o r ld , th e r e a r e tw o k in d s o f n u m b e r s :


E x a c tT h e r e a r e e x a c t ly 1 2 e g g s in a d o z e n .


E x a c tT h e r e a r e e x a c t ly 1 2 e g g s in a d o z e n .

I n e x a c tA n y m e a s u r e m e n t .

Example I f I q u ic k ly m e a s u r e th e w id t h o f a p ie c e o f n o te b o o k p a p e r , I m ig h t g e t 2 2 0 m m . (2 s ig f ig s )


I f I w a n te d to b e m o r e p r e c is e , I 'd m e a s u r e a g a in a n d g e t 2 1 6 m m . (3 s ig f ig s )



I f I w a n te d to b e m o r e p r e c is e , s t i l l , I 'd m e a s u r e a g a in a n d g e t 2 1 5 .6 m m . (4 s ig f ig s )



I f I w a n te d to b e m o r e p r e c is e , s t i l l , I 'd m e a s u r e a g a in a n d g e t 2 1 5 .6 m m . (4 s ig f ig s )

!!!! T h e m o r e s ig f ig s y o u h a v e , th e m o r e p r e c is e y o u r m e a s u r e m e n t !!!!

Precise? Accurate? Which one? P r e c is io n r e f e r s to h o w c lo s e m e a s u r e m e n t s a r e to o n e a n o th e r .E x : O h y e a h , b e t y o u c a n 't g e t th a t n u m b e r a s e c o n d t im e .


A c c u r a c y r e f e r s to h o w c lo s e y o u a r e to th e t r u t h .



T h e r e is a n a s s u m p t io n in a c c u r a c y , w h a t is i t?



T h e r e is a n a s s u m p t io n in a c c u r a c y , w h a t is i t?

Create your own number. T h e n u m b e r o f s ig f ig s is :


T h e n u m b e r o f d ig i t s th a t c a n b e r e a d f r o m th e in s t r u m e n t ...



... + ...



... + ...

... a n a d d i t io n a l d ig i t o n th e r ig h t , th a t is e s t im a te d .



... + ...

... a n a d d i t io n a l d ig i t o n th e r ig h t , th a t is e s t im a te d .

Example: Beaker

T h e b e a k e r is m e a s u r e d in _ _ _ _ _ _ s

T h e v o lu m e is s o m e w h e r e b e tw e e n _ _ _ _ _ a n d _ _ _ _ _

I e s t im a te th e v o lu m e to b e _ _ _ _ _ _ _ _ _ _ _

Example: Graduated Cylinder T h e r e is a n o t ic e a b le c u r v e a t th e to p o f th e l iq u id c a l le d a m e n is c u s . R e a d th e v o lu m e f r o m th e m in im u m o f th e m e n is c u s .

Example: Graduated Cylinder

T h e v o lu m e is s o m e w h e r e b e tw e e n _ _ _ _ _ _ _ a n d _ _ _ _ _ _

I e s t im a te th e v o lu m e to b e :

_ _ _ _ _ _ _ _ _ _ _ _ _

Example: Buret

C o m p a r e d to a g r a d u a te d c y l in d e r , th e v o lu m e m a r k in g s g o in th e w r o n g d i r e c t io n .

Example: Buret

T h e v o lu m e is s o m e w h e r e b e tw e e n

_ _ _ _ _ _ _ a n d _ _ _ _ _ _ _

I e s t im a te i t t o b e _ _ _ _ _ _ _ _ _ _ _

Technology

Writing Volumes From Glassware