200yards

[Ka-Boom!]

Aint as daft as I look then

Actually, you might be...

Speed of sound in air is only linked to temperature. Speed of sound in other mediums is a whole load more complicated!

[Gary C]

Actually, you might be...

Speed of sound in air is only linked to temperature. Speed of sound in other mediums is a whole load more complicated!

Interesting but superficial. Just because the author of this piece says ignore altitude doesn't mean he is literally correct. You ignore altitude because you are using Rho, air pressure. The reason that altitude has an effect is because of the change it has on Rho. If you have already measure Rho then the altitude that Rho is measured at is irrelevent.

If you don't have Rho, and are making a calculation, then you will need the altitude to be able to make it.

http://en.wikipedia.org/wiki/Density_of_air

[baz]

What Gary said

[Ka-Boom!]

Interesting but superficial. Just because the author of this piece says ignore altitude doesn't mean he is literally correct. You ignore altitude because you are using Rho, air pressure. The reason that altitude has an effect is because of the change it has on Rho. If you have already measure Rho then the altitude that Rho is measured at is irrelevent.

If you don't have Rho, and are making a calculation, then you will need the altitude to be able to make it.

http://en.wikipedia.org/wiki/Density_of_air

Sorry, I still don't agree. I can't find any reference to pressure or density (P) being relevant to the speed of sound in air. During my training, I remember being specifically taught that is was purely dependant on temperature.
This page sums it all up quite nicely.

[Gary C]

Merchant.

My congratulations on a well reasoned argument , and I concede happily. My training as a surveyor was 30 years ago time has let me remember some points but let me forget others.

SoS varies with altitude, that is a simple fact.
SoS varies with pressure and density, that is a fact.

However I forgot that the relationship between pressure and density is opposite and equal, therefore as one effects the S0S with altitude the other cancels it out. Therefore, as you said, these factors do not come into play.

However the original assertion with I remember well is that SoS varies with altitude is correct due to temperature and humidity calculations. In Europe, IIRC, temp declines 3 degrees per 1000 feet and humidity changes also. This means that, in theory, given constant humidity and temp S0S will remain constant with altitude, while in practice I know of no geographical region where there phenomena could occur

Many thanks, I've enjoyed re-reading this and it's brought back some memories. My thirst for knowledge quenched, I'm off to surf for porn

[verminhunter]

I'm off to surf for porn

And Bash the Bishop too .

[r.j.s.]

seen this clip. would an owner of a fire arms certificate make such a clip?
Looks a bit odd to me.

[Skoll]

seen this clip. would an owner of a fire arms certificate make such a clip?

The shooter is not from the UK - his youtube profile says he's Polish.

I don't know about Polish airgun law, but I would suffice to say, it is not the same as UK law. It is entirely possible, although I cannot say, that like in the US, airguns of any power are exempt.

[baz]

Actually, you might be...

Speed of sound in air is only linked to temperature. Speed of sound in other mediums is a whole load more complicated!

From that you could say that no matter how far from target the trajectory would remain the same

Gary is pretty clued up on this subject but I admit I aint