Page 35 - E-Module Berbasis Problem Based Learning Pada Materi Koloid oleh Sarah Shafa F

K e g i a t a n B e l a j a r 2
K e g i a t a n B e l a j a r 2

INVESTIGASI

Investigasi Mandiri : Ulasan Materi

GERAK BROWN

G e r a k B r o w n d i t e m u k a n o l e h R o b e r t B r o w n p a d a
t a h u n 1 8 2 7 . J i k a p a r t i k e l k o l o i d d i a m a t i p e r g e r a k a n n y a

m e l a l u i m i k r o s k o p u l t r a , d a p a t d i a m a t i b a h w a p a r t i k e l

k o l o i d t e r s e b u t m e n g a l a m i g e r a k a n y a n g c e p a t .

P e n g a m a t a n t e r s e b u t m e m b u k t i k a n b a h w a , p a r t i k e l

k o l o i d t i d a k p e r n a h b e r a d a p a d a d a l a m k o n d i s i d i a m .

M e l a i n k a n , p a r t i k e l k o l o i d a k a n b e r g e r a k d e n g a n

l i n t a s a n l u r u s y a n g p e n d e k d a n m e n g u b a h a r a h g e r a k n y a
s e c a r a m e n d a d a k ( z i g - z a g ) s e p e r t i d i i l u s t r a s i k a n p a d a

g a m b a r d i b a w a h .

G e r a k B r o w n d i p e n g a r u h i o l e h

u k u r a n p a r t i k e l d a n s u h u , a n t a r a
l a i n s e b a g a i b e r i k u t :

1 . S e m a k i n k e c i l u k u r a n p a r t i k e l

k o l o i d , g e r a k B r o w n s e m a k i n

c e p a t .

2 . S e m a k i n b e s a r u k u r a n p a r t i k e l

k o l o i d , g e r a k B r o w n a k a n

s e m a k i n l a m a .

3 . S e m a k i n t i n g g i s u h u k o l o i d ,

g e r a k B r o w n a k a n s e m a k i n

c e p a t .

4 . S e m a k i n r e n d a h s u h u k o l o i d ,
Sumber: The Molecular
g e r a k B r o w n a k a n s e m a k i n Nature of Matter

l a m b a t .
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