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Silly Questions

Ever had what you consider a 'silly question' that you dare not ask ?

You may well, not have asked a question before as you may have thought that everyone should know, yet you don't.

To our mind this is not your fault that you do not understand.

It will be down to how you originally learned the topic when it was introduced to you. Our opinion is that the reason you don't know is because it was not explained to you in a way that you under stood.

Therefore we like detail some here for you now :-

Weight vs Volume

If we take tap water as an example everyone knows and understands.

100ml of tap water weighs 100gm. This is a ratio of one to one (written 1:1). 

1ml of tap water = 1gm

500ml of tap water = 500gm

1000ml of tap water = 1000gm or 1kg (kilo).

Tap water has a weight to volume ratio of 1. (500ml = 500gm)

This density is called the 'specific gravity' (S.G for short). S.G is simply a way of describing the density to volume. 

Tap water has a specific gravity of 1.0. We write this technically as S.G=1.000

An S.G of 1 means 1 lite per kilo. 

Milk has an S.G of 1.028-1.033, so milk is heavier than water.

Ketchup has an S.G of 1.15 so it is heavier than milk.

Every different type of liquid, powder, solvents, pastes and Plasticine have a different S.G.


Viscosity is the technical term used to define how runny or thick a liquid is. 

Tap water is thinner than car engine oil for instance. Both are 'runny' BUT water is thinner than oil. Oil is more 'viscous' (thicker), less runny some might say.

S.G and viscosity

Problems face the world when mixing materials that are different.

The S.G and viscosity can cause problems. Ever mixed flour, eggs and milk together to make a pancake mix ?

You will understand then. We will also agree that each individual ingredient (products) of our pancake mix are different.

You could term these as different products, or 'dis-similar products'.  We prefer in the industrial world, to use the term 'dis-similar materials'.

Imagine three plastic 1 litre pots. Each were, empty the same weight and their volume, dimensionally and volumetric-ally identical.

If you filled one to the top with milk, one with flour and the other with eggs. Which would be heavier ?  

If you had filled the pot with sieved flour and weighed it you would get one weight. If you pressed the flour down with the back of a spoon, it would squash the flour and you could get more in. If you did this again and again until the pot was full, flat on top and then weighed it, it would be much heavier than the first one yet. You'd expect this but the volume (mass of the pot) would be the same.

Hard to describe so this is where S.G comes in handy.

The first example 

Once you have completed the first mix your chosen material types. With some basic controls, this mixing process can easily be repeated, the finished product will be the same every time. Time after time. 


We have simplified these into three series, each based on the amount they are designed to mix.

Weight alone can be confusing so we've detailed the volumes the SpeedMixers containers will hold.

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