Anagoge

iNow, the "How Stuff Works Page" is pretty much exactly what I wanted. Thank you very much. I didn't Google it because I thought it was a fairly strange question. Perhaps not as strange as I thought! According to that page, I've worked out that a 9 inch balloon can lift 7.7g, which is far more than my 1.86g business card! That's great. Thank you for the quick and very useful help.

Hi tvp, thanks for responding. To answer your first question, no, it's not a class assignment. It's actually for a personal project that I'm working on. I didn't include the details because I wanted my post to be as succint as possible, but perhaps more details will help. I'm a graphic designer. My logo is a hot air balloon as seen on my website http://www.theworkof.co.uk. To promote myself, I plan to set some helium balloons free. Each balloon will have a business card attached. I want to know if the helium inside the balloon will be enough to lift a business card attached to it. Earlier tonight, I found out that my business card will weigh no more than 1.84g. I still don't know how much helium would be inside a balloon, but I do know that the balloon is 9 inches in diameter. Before I purchase helium, balloons and a special set of business cards for this event, I want to know if the balloon will be able to lift the business card and not only lift it, but carry it off into the sky as if nothing was attached to it. Thanks for the further help!

I do hope I've posted this in the right forum. Apologies if it isn't. I need to know how much weight a latex balloon filled with helium can lift and still happily sail away into the sky. I know there's no real 'standard' size for a balloon, but if you can imagine your typical birthday party balloon, that might help. What I *don't* mean are the foil balloons. I realise that to answer this question, you would need to know how much helium is inside a balloon. I don't have an answer to this and I'm hoping that you can guess an educated guess to estimate how much would be inside a balloon. So, to clarify, I would like to know as accurately as possible how much weight (in grammes if possible) a helium-filled latex balloon can lift and still float high in the sky. Thanks if you can help with this strange question!

Thank you for the help. That link is quite useful. However, according to that, the indicator would only turn a different colour. Is there anything that would become transparent instead? For example, just imagine that while in the presence of acid, the message said "ON", but in the absence, "OFF" - It would be confusing to see both "ON" and "OFF" and one of them would need to be hidden/clear/dissolved. Basically not visible. Any suggestions? Edit: One more thing that may be useful to know is that once this chemical/material has been exposed to air and no longer visible (after being submerged in fruit juice), there isn't any requirement for it to reappear. In other words, as the container empties, it's acceptable that the chemical can lose its activeness because there is no chance of the container being refilled.

I'm a graphic designer doing a project surrounding fruit smoothie advertising. The concept is to fill a poster-sized clear container with actual smoothie which then dispenses a sample to the public. On the inside of the container would be typography/visuals stuck to the front wall of it. As the container empties, the typography/visuals would disappear and would be replaced with different visuals on the back wall of the container. So, there would be one message while the container is full and another when it's empty and both of these messages would depend on how much of the smoothie had been dispensed. I hope that helps.

I'm not sure if this is in the right forum so apologies if it isn't. I'm looking for two things. Firstly, some form of edible chemical or material treated with a chemical that would either turn translucent/transparent or break up when exposed to air, but be visible and cohesive when in an acidic liquid (i.e. fruit juice). Secondly, I'm looking for something that does the opposite of the above. Something that is translucent/transparent in liquid, but when exposed to air becomes visible. If these two things happen to be the same chemical, that would be great, but it's just as useful if they happen to be two separate things. The chemical and/or material must be edible as it would be in contact with juice that people would be drinking. I'm in no way knowledgeable about chemistry so a simple explanation would be very much appreciated! Additionally, if you know of somewhere where I could read up further on such a chemical/material that would be great, as it'd back up my research. Many thanks for your help. Neil Martin