Page 54 - York Global Science 6 - Physical Science
P. 54
Diffusion is quicker in gases than in liquids because the particles in a gas are
more spread out and have less chance of colliding with each other, which
would slow them down.
Diffusion cannot happen in solids because the particles are closely packed
and in a fixed position.
How fast diffusion happens is affected by the:
• concentration gradient – the higher the concentration gradient, the faster
the diffusion
• temperature – the higher the temperature, the more energy the particles
have and the faster they move, so diffusion is faster.
Think!
How else can you make diffusion faster?
Let’s Look
1 Put some coloured sweets on a plate like the picture below.
2 Pour some warm water into the centre of the plate until it is just past the
inside edge of the circle of sweets.
3 Watch what happens.
Complete the worksheet in the Workbook to describe and explain what
happens.
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