Skip over navigation
NRICH
Main menu
Search
accessibility
contact
Skip over navigation
Terms and conditions
Home
nrich
Students
primary
age 5-11
primary students
secondary
age 11-18
secondary students
Post 16
age 16+
post 16
Teachers
early years
age 0-5
Early years
primary
age 5-11
Primary teachers
secondary
age 11+
Secondary teachers
More links
Topics
Events
Nrich Events
Donate
Donate to NRICH
Dilution Calculator
Age 14 to 18
Challenge Level
Dilutions
100 000
cells/ml
?
cells/ml
100ml
0ml
10ml
20ml
30ml
40ml
50ml
60ml
70ml
80ml
90ml
100ml
0ml
10ml
20ml
30ml
40ml
50ml
60ml
70ml
80ml
90ml
100ml
0ml
10ml
20ml
30ml
40ml
50ml
60ml
70ml
80ml
90ml
100ml
0ml
10ml
20ml
30ml
40ml
50ml
60ml
70ml
80ml
90ml
100ml
0ml
10ml
20ml
30ml
40ml
50ml
60ml
70ml
80ml
90ml
100ml
0ml
10ml
20ml
30ml
40ml
50ml
60ml
70ml
80ml
90ml
100ml
0ml
10ml
20ml
30ml
40ml
50ml
60ml
70ml
80ml
90ml
100ml
0ml
10ml
20ml
30ml
40ml
50ml
60ml
70ml
80ml
90ml