Tenacity asked:


This is a ‘challenge’ to the question previously asked by, and answers given to, *pingpong* on 10/2/08 —> http://answers.yahoo.com/question/index?qid=1006042600384

I believe most, if not ALL, answers stated no. While they may have been right…they either did not explain themselves correctly, made incorrect assumptions or assertions, and were usually, technically, incorrect.

The correct answer to his question, in general, is “it depends.” But, on Earth, assuming a ‘hot air balloon’ is a traditional design, nylon canopee w/ an interior pressure system not isolated from the exterior pressure system - then, practically, no.

The question hinges on the environment surrounding the balloon and how it all impacts buoyancy. A good counter-example to all the responses of “no, it is absolutely not possible” is a ping-pong ball (oh my, how appropriate!) in a tub of water.

Let’s assume the temperature inside the ping-pong ball is the exact same temperature as the water surrounding the ping-pong ball. Regardless of the temperature which both the ball and the fluid water share, the ping-pong ball will ALWAYS float; this is because of BUOYANCY, a concept that was taken for granted with the previous answers.

(Now, to all refuting of “but the ping-pong ball is closed, the hot air balloon is not! - remember, you can do this with half a ping-pong ball too. The trapped air bubble will still lift the ball…buoyancy!)

So, it is certainly possible. Is it feasible? Not likely. Buoyancy is, in this example, a product of interactions between fluid and an object (yes, the surrounding air is a FLUID while the balloon is a hollow object containing more of the same fluid.) when the fluid and the object differ in density, NOT TEMPERATURE. While temperature is certainly a good factor or indicator of, as well as method of manipulating, density, it is not the last straw…a mistake I feel a few on this board made.

A hot-air balloon allows lift within the air by manipulating the air within the balloon…(tongue twister? :-D) By heating the air inside the balloon, you cause the air particles to energize or ‘excite’ - this excitement causes them to expand, and causes less air particles to occupy the same amount of space within the balloon canopy than if the air was at room temperature… = a fluid with less density than ‘normal’ air.

1) If the atmosphere of a planet contained a gas more dense than air (i.e. Sulfur hexafluoride), and the inside of your hot-air balloon contained Earth atmosphere…then the two could be at the same temperature, ANY temperature, and the balloon would rise.

2) You could attempt to increase the pressure of the atmosphere on Earth, thus making the atmosphere gain density…but then this would put pressure on everything, including the hot-air balloon, causing the hot-air balloon to shrink in size and displace less atmosphere = less air contained within = reduced density, so we’d be right back to where we started, right?…….UNLESS we somehow were able to isolate the pressures of the balloon from the outside atmosphere (in a sense, a ‘reverse pressurization’ of what happens on a plane, so instead of sealing to contain higher pressure within, we seal to contain a lower pressure system)… In that case, we’d have two isolated pressure systems, and no matter what temperature the inside of the balloon and the outside atmosphere shared (assuming the buoyancy of the balloon generated from the interaction with the surrounding atmopshere is enough to counteract any gravitational forces), the balloon would always rise.

3) Since #2 isn’t really in the spirt of a hot-air balloon (since those pressure systems would be isolated), let’s think about the ping-pong ball. If that half ping-pong ball had been at the bottom of the ocean with a little bubble under it…it would have been crushed and compressed, the force of the fluid around it (6 miles of water) would have overcome any static force the outside of the ball would have generated against the water…and in a little way, Earth’s atmosphere is the same way when it interacts with a hot-air balloon - if the pressure of the surrounding air increases, the balloon will compress, it doesn’t have much of a ‘defense’ because the material used to trap the hot air within is light and not rigid, this helps with functionality and to reduce weight.

THIS characteristic of the ballon specifically prevents a hot-air balloon from performing what *pingpong*’s original inquiry was about…now, if you could create a large, rigid balloon that trapped air like a half of a ping-pong ball, and didn’t change VOLUME regardless of the pressure surrounding it, then yes, you could have an Earth atmosphere with 85 degrees, 4 bar pressure and 85 degrees, 1 bar pressure atmosphere inside the ‘balloon’, and it would rise.

Make sense? (sorry, I just **** it when people say the right answer and simultaneously think they’re right but, for whatever

Jake K asked:


i never realized she was wearing makeup to hide her ugly *** face she has millions of ugly *** freckles and a chin that could touch the wall before her ***** not saying shes got any cuz they were bigger than they really are she wore a water bra to have bigger busts and when it came to *** we decided to try it in the hot tub at her house so shes all undressed and comes to me in the hot and i realized how ugly she was and dumped her *** on the spot not to mention all her lies about her **** size and stuff heres her myspace profile check out the ugliness!

http://profile.myspace.com/index.cfm?fuseaction=user.viewProfile&friendID=132782859

sunkissedfwb asked:


I have a Streamway older model mobile home tub faucet . The seat on the hot side has broken off,so when I remove it, it somehow cross threaded the valve body slightly. The size is 1/2″ diameter ,with 24 thread count (1/2 #24) I cannot find a tap in that threadcount size at any Lowes,or Ace hardware.
I hear I can also re-tap it using a 9/16 24 tap, but I have to find one!
Should I re-tap it,run a bolt through it,replace it, etc…?
Any tricks of the trade??
Any suggestions on this would be greatly appreciated!

karma’s mom asked:


the amount of water used would all be from the shower head, not the faucett, tub size doesn’t matter, the water used is equal from both hot and cold faucetts and no water saving devices are used

ZoeGirl asked:


I’m 13 years old and i’ve never had Chicken pox before, i don’t feel sick i don’t have a headache. They itch every now and then, an go from my neck to my ankles mostly- their mostly on my stomach and arms they range in size. I’m not on any medication- i was in a hot tub at a rented house in colorado for vacation, does that mean i may have a possibility of an allergic reaction?

Marge asked:


pool sized bubble bath?

poll:….pool or hot tub

E&M asked:


all the way this weekend. we’ve been together for 7 months. she didn’t want *** till now so i didn’t pressure her. i’m almost 18 and she’s 17. i’ll have the house to myself for the whole day. family’s going away for two nights. any advice? we got a pool, hot tub, big jacuzzi tub, nice sized shower, big water bed and big regular bed, so what would be the best place to start things out and finish them off?

mint asked:


A few days ago I was sitting in a hot tub when I look up to my neighbor’s fences, and above it I saw this streak of light that was only about 6′ ft in the air and the streak of light lasted about 2-3 seconds until it was gone. It wasn’t a huge streak of light, it was medium-sized. If there were any way to describe it, I would say that it looked like a mini-shooting star, except not in the sky, but happening above my neighbor’s fences.Can anyone describe what you think it was?

Vegas Matt asked:


And I don’t mean an Olympic sized pool or anything, just your typical backyard sized, in ground pool with attached hot tub. About how much will your water and power bills go up, and how much do you spend on chemicals and supplies annually? Please try to give dollar amounts or percent increases. I need numbers, not “a lot.”

I live in Las Vegas which gets over 100 degrees in the summer, and we would not use it during the winter months. Assume about 2 extra months of use time if you live in the midwest or somewhere with snowy winters.

Thanks a lot!

swimmer111 asked:


i need a good comparison to size up what 1500 cans would look like (i don’t know but ie: fits in a small car, the size of a room, size of a truck, enough to fill a hot tub) these aren’t actual things i’m suggesting just to help you out or better yet, what would 4 years food supply of canned food look like? I mean if someone were to eat nothing but canned food for 4 years, what would that be incomparison to
or better yet, what would 4 years food supply of canned food look like? I mean if someone were to eat nothing but canned food for 4 years, what would that be incomparison to