After much procrastination (and I really do *not* like the fact that Wollemi was registered as a trademark here in the USA), I finally ordered a Wollemi Pine from the Wollemi Pine North America Website on 1/5/2008, and it arrived via UPS 2nd Day this week on 1/17.ustralia wrote: I bought my Wollemi a few weeks ago at a garden show here in Sydney. For $45 I received a 2 ft tall tree in lovely condition. I repotted it in a good humous soil and decided to keep it in a pot to re use as our Christmas tree in the future.
11â latex balloons generally last between 12â20 hours filled with helium, and about 2â3 days when treated with HiâFloat. balloons last approx. 5â7 days. Airâfilled balloons generally last for a couple of weeks, but will not float.
Thus even the air inside would be heavier than the equivalent mass of uncompressed air outside. Therefore it also makes sense to use a material that does not stretch. In order to make the balloon float, we must fill it with a gas that is not as dense as the air that surrounds it. Helium is ideal because the molecules are spread out much more than the molecules in the surrounding air -- and is therefore lighter (fewer molecules means less weight for a given mass of gas). Moreover, the material used in helium-filled balloons (party balloons) is wafer-thin and extremely light.