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Turn every snow day into a craft day with these fun winter crafts for kids! From cheery snowmen to playful penguins, these DIY projects will bring warmth to even the coldest days.
An example image from a hobby high-altitude balloon launched by the Make Stuff Club from Kalamazoo College A photo taken from a 1,500 g (3.3 lb) weather balloon at approximately 100,000 ft (19 mi; 30 km) above Oregon A latex weather balloon bursting at about 29.5 km (18.3 mi; 97,000 ft)
A weather balloon, also known as a sounding balloon, is a balloon (specifically a type of high-altitude balloon) that carries instruments to the stratosphere to send back information on atmospheric pressure, temperature, humidity and wind speed by means of a small, expendable measuring device called a radiosonde.
how much helium is needed? Enough to fill 600,000 to 700,000 Mylar party balloons. But the parade helium is 99.999 percent pure, whereas the stuff in a party balloon might be only 97.5 percent pure.
The enclosed helium atoms escape through small pores in the latex which are larger than the helium atoms. However, some types of balloons are labelled "helium-grade". These balloons are often thicker and have less porosity. [3] Balloons filled with air usually hold their size and shape much longer, sometimes for up to a week.
If you’ve got kids and are in the loop of hosting kids’ parties, you probably know just how valuable a helium tank can be. This helium tank is now $29.99, marked down from $39.99.