The aim is to increase understanding as widely as possible that pressure is not a guide to volume of gas remaining in a BBQ propane tank. This is a basic fact of physics. See below. By making, uploading and promoting a video that demonstrates this fact we aim to spread the knowledge so that consumers can make a better choice when looking for a way to tell when their tank is getting low.
Propane is a liquefied gas. And this means that the pressure above the liquid is only dependent on the liquid temperature. So whether a BBQ 20 pound capacity tank is full or nearly empty, provided both tanks are at the same temperature, the pressure of the gas above the liquid will be the same.
* Have two identical tanks: One full the other nearly empty
* Both should have pressure gauges fitted. (or you could use one gauge and swap it over) See here for pressure gauge
* Demonstrate the quantity of gas by weighing both tanks one by one. Show the result on the video. (You can get a special tank scale at Amazon) Or you can use a standard bathroom scale. Remember that the weight of propane is the total weight minus the empty (Tare) weight of the tank. This weight is marked somewhere on the tank body.
* Then hook up the full tank to your BBQ but with the burners switched off. (This will give the static pressure in the tank)
* Open up the tank valve and show the reading on the gauge. Maybe ask a partner beforehand what she thinks it will read? ‘Full’ she will say.
* Close the tank valve and then connect the nearly empty tank in exactly the same way.
* Before turning on the tank valve ask your partner again what she thinks the gauge will read. (Her answer should be something like ‘nearly empty of course!’)
* Turn on the tank valve and show the result. Lo and behold! The gauge reads the same. Partner should be surprised and amazed! ‘Why is that’ she says
* Clever clogs (you) then explains the Propane is a liquefied gas. And the pressure does not vary until all the liquid has gone. And that means the gauge will only start to drop just before the gas runs out. Certainly not in time to finish grilling.
* The above scenario with a female partner acting as the stooge is a bit sexist. Maybe she could be the clever clogs, and you the stooge? Might attract more attention.
* The above is just one draft script. But there are many ways to demonstrate this. Entrants to the competition can invent their own script. The prize will go to the video that combines a number of elements:
* Clarity that pressure does not tell you volume
* Humor. If the video make people laugh or smile it will have wider appeal
* The number of views or references on social media and number votes/likes.
* Entrants should send a link to their video to: http://woobox.com/6tvegp?web=1 giving their name, address and contact details. (see below for Prizes)
* The competition ends on 31st January 2015
* Entrants agree to allow their video(s) to be promoted by Propane GasGenie and other parties. If the entrant wants his name can be shown as creator of the video
The winner will be decided on the basis of
- Clarity of message
- Reach (how many hits, votes, likes and other social media interactions.)
* The choice of winner is entirely that of the competition judges and cannot be challenged.
* The winner gives permission for his/her name and location to be mentioned on social media. (Just first name and State or name, town and State)
* In the unlikely event that there are no worthy entrants the prizes will not be allocated.
* Entrants may submit more than one video if they wish.
* The competition is only open to US residents
First prize is a check for $250! Once the competition has ended and the judges have decided on a winner he/she will be contacted and sent the winner's check. They will also receive a free Propane GasGenie
The top 12 runners up whose video meets at least the first criterion (Clarity of message) will receive a free Propane GasGenie once the competition has ended. (Maximum one per entrant)