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Maths Question

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Palustris | 09:39 Wed 05th Feb 2020 | Science
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I have to mix some things together at the rate of 0.5kg to a cubic metre. Now 1 cubic meter is 1,000 litres. So the question is how much do I add to 1 litre?
TIA.
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0.5 kg is 500g
500g divided by 1000 is 0.5g.
That sounds like a very small amount
Not if it's plutonium, FF.
5kg = 5000 ml divided by 1000 = 5ml
oops grms not ml
Yes danny- but the OP said 0.5kg per cubic metre
Ignore my posts (senior moment)
500 gms to a cubic metre
500 gms to 1,000 litres
Divide both sides by 1,000
0.5 gms per litre
Mental arithmetic rather than maths.
0.5g = 500mg. For sugar, for example, that would be about a tenth or eight of a teaspoonful, so that might give you an idea of the amount if you don't have scales that measure such small weights
Question Author
It does seem rather a small amount. The mix rate is given on the info is 0.5kg/m3. My brain is refusing to function today.
I can't add anything to the maths -- is there some info about what it is you're being asked to mix?
0.05% is not an unusual amount for an additive.
Are you only wanting one litre or are you just needing to know a per litre figure so that you can work out what you need for, say, 10 or 50 litres?
It seems odd that the instructions would give rates based on such big units when users would sometimes need much small quantities such as a litre. It's a bit like having a glass of draught beer priced by the barrel
I'm wondering why the product is so concentrated, do folk often use hundreds of litres of the diluted product?
Question Author
Yes, the material is often used in bigger quantities than I am proposing to do. Too little and it has no effect, too much and it becomes expensive. Like 1k is £128.
Thanks I think I can work out how much to add to say 5 litres from that.
25 grams?
?!?
1 litre needs 0.5g
2 litres need 1g
3 litres need 1.5 g
4 litres need 2g
5 litres need 2.5g
Would you be able to buy 2.5g? That's about half a teaspoon full if it's like sugar. Maybe the smallest bag is say 1kg
What is it you're doing by the way? Was wondering if you might be doing something like casting and adding colour to resin.
Once five is five
Two fives are ten
Three fives are fifteen
Four fives are twenty
Five fives are twentyfive

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