wrote:

Is a pressurized air object heavier?
In other words, is an object heavier when it contains compressed air
than when it's empty? For example, if I have a tire and weigh it
before pumping it full of air, will it be heavier after it's pumped
up? I say NO. A friend of mine insists it will be heavier once it's
filled with air. Who is right?

This is one of those fun topics that no one can agree on, and would
require a very accurrate scale that would most likely need to measure
down to the milligram.

Note: This would be regular compressed air from an air compressor, not
helium or another gas, which might make it lighter (even though I
highly doubt a tire full of air would float).

Mark


I suspect I've been trolled, as it's hard to believe that anyone with
enough neurons to be able to post a message to a newsgroup could be
naive enough to say NO to that question.

Jeeze, next you'll be asking if a shipping container with 200 canaries
in it weighs less if the birds are all flying around inside it than if
they're all standing on the floor.

Try something a little more interesting like the kid's helium balloon on
a string floating inside a schoolbus. Which way does it move when the
bus driver brakes quickly, forwards or backwards, and why?

Jeff

--
Jeffry Wisnia

(W1BSV + Brass Rat '57 EE)

"Truth exists; only falsehood has to be invented."

"Jeff Wisnia" wrote in message
news:yZidna7sUJK93v_eRVn-

Try something a little more interesting like the kid's
helium balloon on
a string floating inside a schoolbus. Which way does it
move when the
bus driver brakes quickly, forwards or backwards, and why?

Why not?

Bob

In article , Jeff Wisnia wrote:

Jeeze, next you'll be asking if a shipping container with 200 canaries
in it weighs less if the birds are all flying around inside it than if
they're all standing on the floor.

Depends on whether the container is airtight or not, and, if airtight, if
there's enough air in it to keep the birds alive.

Try something a little more interesting like the kid's helium balloon on
a string floating inside a schoolbus. Which way does it move when the
bus driver brakes quickly, forwards or backwards, and why?

Inertia causes air to move forward, increasing the air pressure in the front
of the bus -- thus pushing the balloon backward.
Jeff


--
Regards,
Doug Miller (alphageek at milmac dot com)

It's time to throw all their damned tea in the harbor again.

Inertia causes air to move forward, increasing the air pressure in the
front
of the bus -- thus pushing the balloon backward.

WRONG.

The balloon moves forward.

I would explain why, but since we all know that Doug is never wrong,
there really isn't any point; because Doug will never concede he is
wrong.

So, I'll leave it to others to convince him.

"I would explain why, but since we all know that Doug is never wrong,
there really isn't any point; because Doug will never concede he is
wrong. "


DAMN.

Jeff, why'd ya have to go and change the riddle on me?

Oh well.

Sorry Doug.

I have to go scrape egg now.

Matt wrote:
"I would explain why, but since we all know that Doug is never wrong,
there really isn't any point; because Doug will never concede he is
wrong. "


DAMN.

Jeff, why'd ya have to go and change the riddle on me?

Oh well.

Sorry Doug.

I have to go scrape egg now.



Well I could have asked which side it moves to when he takes a left
turn, (Right of course.)

And, I didn't actually read it as a riddle. I first saw the balloon
thing happen many years ago through the back window of a "station wagon"
in front of me, and put 2+2 together.

Speaking of math... and limericks...

A dozen. a gross and a score,
Plus three times the square root of four,
Divided by seven,
Plus four times eleven,
Equals nine squared plus zero, no more.

Jeff







--
Jeffry Wisnia

(W1BSV + Brass Rat '57 EE)

"Truth exists; only falsehood has to be invented."

"And, I didn't actually read it as a riddle. I first saw the balloon
thing happen many years ago through the back window of a "station
wagon"
in front of me, and put 2+2 together. "


Ah.... well, it's an old brain teaser, but it usually reads what
happens to a helium balloon when the driver _accelerates_.

In article .com, "Matt" wrote:
"I would explain why, but since we all know that Doug is never wrong,
there really isn't any point; because Doug will never concede he is
wrong. "


DAMN.

Jeff, why'd ya have to go and change the riddle on me?

Oh well.

Sorry Doug.

I have to go scrape egg now.

ROTFLMAO

--
Regards,
Doug Miller (alphageek at milmac dot com)

It's time to throw all their damned tea in the harbor again.

Tom Quackenbush wrote:

Jeff Wisnia wrote:
snip

Well I could have asked which side it moves to when he takes a left
turn, (Right of course.)


Howzat? Doesn't the air (not to mention your cup of coffee and
cellphone) go forward & to the right when you make a left turn? I'd
think that the helium balloon would go to the back & left.

R,
Tom Q.


See, I just proved that nobody's perfect, not even me.

Jeff

--
Jeffry Wisnia

(W1BSV + Brass Rat '57 EE)

"Truth exists; only falsehood has to be invented."