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On 1/7/2020 at 12:13 PM, Phi for All said:

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Moderator Note

Moved from Science Education to Engineering.

 

First you need to establish that this phenomenon happens to more than just yourself. An experiment needs to be devised.

Besides different brands and compositions, you also need to factor in the amount of hair present (and possibly length - does long armpit hair use less product than a short stubble?), as well as temperature and humidity conditions. Does the pressure used affect the wear, and do men and women use differing pressure when applying it? And as Bufofrog mentions, the shape of the armpit is also a factor.

Why do you find this bizarre? As a guess, I think if you experience any unevenness in the application of a product like deodorant, it's most likely because the manufacturer receives no benefit from changing. If you're satisfied with the price, shelf life, and how the product takes care of the problem you bought it for, that's where the manufacturer is focusing their efforts. It could also be that the uneven wear makes you use the product faster (trying to even it out) and purchase more. 

That's definitely true. Those are some good points you made. I think you're right in the fact that I would have to do an elaborate experiment in order to accurately figure it out. Of course it may largely be due to the shape of the human arm pit, rounding the shape over time. Thanks for the help!

I always noticed that deodorant sticks become uneven after being used for a while. It doesn't bother me, but has always made me curious as to what exactly is the scientific process that does something so bizarre yet so interesting. I've always found nature's effects on modern technology as well as humanity itself to be an interesting study.

14 hours ago, studiot said:

Good morning and welcome.

Yes it is true that too many folks talk of proof when mean something else.

The meanings of proof and evidence are pretty much the same in Mathematics, Science, Philosophy and the Law.

Proof requires a proposition, evidence does not (although evidence may be offered, rightly or wrongly, in support of a proposition).

Consider the equation

a + b = a * b

Now the statement  a = b = 2 is evidence that the equation is sometimes valid, but it is not true since for example it is not true for  a = b = 3

So the proposition that the equation is always valid is false and cannot be proved.

But the proposition that the equation is sometimes valid is true and is proved by the evidence of the eaxmple a = b = 2.

But consider the forensic science statement "Mr B died at 8 pm"

This is just evidence, there is no associated proposition. By itself it is not proof of anything.

 

Proof finds most use in Mathematics and Philosophy since it can be taken to mean,

"The proposition is consistent with the axioms or premises"

Since most parts of maths and philosophy concern abstract constructs this does not mean that a proof has any substance or validity in 'reality' or the observable environment.
This also confuses many.

 

Other areas of scientific thought and the legal profession tend to consider "The balance of the evidence" , rather than proof.
So we have no absolute 'proof' of the Laws of Thermodynamics.
But they have never been observed to fail so every instance is supporting evidence for them.

I see. That definitely clears things up. Thanks for the help!

I would like to know exactly what is the difference between the meaning of the terms "proof" and "evidence" since I feel like a lot of people use the term proof when they discern something that is explicitly indicative of something else happening, but can possibly still even yet be dismissed by further "proof" that the previous "proof" is untrue and must be debunked. If someone could clear up the meaning of these two concepts, that would be great!