Purestock/Purestock/Getty Images. Hydroxycitric acid, which comes from the Garcinia cambogia fruit, is often sold as a weight-loss supplement. The fruit itself is used as a condiment in Southeast Asian dishes, such as curries.In purified supplement form, hydroxycitric acid may cause some side effects, so check with your doctor before adding it to your daily regimen.he fruit itself is used as a condiment in Southeast Asian dishes, such as curries. In purified supplement form, hydroxycitric acid may cause some side effects, so check with your doctor before adding it to your daily regimen.
Why is liquid nitrogen used to fast freeze food instead of liquid oxygen? There are two reasons. First, liquid nitrogen is colder than liquid oxygen and thus more effective at flash freezing.
For many years, incandescent bulbs were filled with nitrogen gas. When argon became more affordable, it was substituted for nitrogen because it decreased the rate of evaporation of the tungsten filament and increased bulb life. More recently, krypton or xenon are used in some bulbs in place of argon. Because the molecular size is larger than argon, both these inert gases do a better job of retarding the evaporation of the filament and give longer life to the bulb.