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# Re: (TFT) Energy decrease in explosions

```Jay, I admire your dedication and I mean no disrespect by saying this but
seriously, I think you would likely enjoy and benefit from reading some
basic physics lessons. There is more than one disconnect in your logic,
and I'd start with getting your physics and terms straight. PSI is pounds
per square inch which is a force per surface area. Mythbusters may tend to
talk about it because a physical intrusion (e.g. a projectile) needs to
exceed a certain psi to break into another structure (e.g. a target object
you want to break into). But force is not the same concept and energy, nor
is force psi, nor are any of the same as power or momentum.

Knowing what is happening at least as important than knowing how much
energy is involved. Numbers only matter within an understood context.

Exceeding a certain psi is a threshold for breaking into another object,
and is _akin_ to TFT armor stopping X points of damage per attack, but
total damage is going to be how much deformation is done, which is more
like total energy that reaches meaningful parts of the target.
Distinctions involve things like the shape and nature of the contacting
objects - a level can multiply force, and a small striking area can
concentrate it on a small point, but a larger striker can cause more
widespread effect...

PvK

On Mon, May 5, 2008 2:25 pm, Jay Carlisle wrote:
>> ----- Original Message -----
>> From: pvk
>>
>> Um, no? You can assert the philisophical truthiness of "energy is
>> energy"
>> but it doesn't imply that psi is a unit of measure for energy, nor that
>> psi or energy directly equate to damage.
>>
>
> Fair enough Peter,
> Maybe I'd better eludicate a bit more.
>
> The data that I get off these shows like Mythbusters, and Sports/Fight
> Science tend to measure force in psi, ergo my use of it.
>
> I believe I did these for 200lbs but it'll give an idea.
>
> 200psi ~ 0.36 hp or ~ 65 calories or ~ 10,000 newtons or ~ 270 Watts or ~
> 270 joules or ~ 0.25 BTU's or...
>
> Now I repeat.
>
> Jays math is not to be trusted, not to mention my reasoning, hells bells
> don't trust me at all.
> But I'm pretty sure I can convert force to a bunch of diffrent units.
>
> Of course Maou Tsaou is a Chineese term for a Scolar who, having failed,
> gives himself over to wine.
>
> I'm more concerned with the valadity of the idea than with the actual
> figure for 1pt dam at this point.
>
> Thanks for your thoughts Peter.
>
>
>
> Jay
>
> --
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```