Maths Question

[Palustris]

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.

[fiction-factory]

0.5 kg is 500g
500g divided by 1000 is 0.5g.
That sounds like a very small amount

[douglas9401]

Not if it's plutonium, FF.

[dannyk13]

5kg = 5000 ml divided by 1000 = 5ml

[dannyk13]

oops grms not ml

[fiction-factory]

Yes danny- but the OP said 0.5kg per cubic metre

[dannyk13]

Ignore my posts (senior moment)

[Old_Geezer]

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.

[fiction-factory]

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

[Palustris]

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.

[jim360]

I can't add anything to the maths -- is there some info about what it is you're being asked to mix?

[nescio]

0.05% is not an unusual amount for an additive.

[fiction-factory]

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?

[fiction-factory]

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

[THECORBYLOON]

I'm wondering why the product is so concentrated, do folk often use hundreds of litres of the diluted product?

[Palustris]

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?

[Old_Geezer]

?!?

[fiction-factory]

1 litre needs 0.5g
2 litres need 1g
3 litres need 1.5 g
4 litres need 2g
5 litres need 2.5g

[fiction-factory]

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

[THECORBYLOON]

What is it you're doing by the way? Was wondering if you might be doing something like casting and adding colour to resin.

[Old_Geezer]

Once five is five
Two fives are ten
Three fives are fifteen
Four fives are twenty
Five fives are twentyfive