What Is Obesity Hypoventilation Syndrome? Obesity hypoventilation (HI-po-ven-tih-LA-shun) syndrome (OHS) is a breathing disorder that affects some obese people. In OHS, poor breathing results in too much carbon dioxide (hypoventilation) and too little oxygen in the blood (hypoxemia). OHS sometimes is called Pickwickian syndrome.
Click on photo for a larger picture. In the photo above, I am holding two small vials of liquid metal. The vial on the right contains gallium, an element that melts at 29.76Â° Celsius (85.57Â° Fahrenheit). The vial on the left is an alloy that contains gallium, indium, and tin, and melts at -20Â° Celsius (-4Â° Fahrenheit). The gallium is liquid because I had the bottle in my shirt pocket, next to my warm body.
Some metals melt at lower temps than others. Tin becomes liquid at 231.8ËC (447.8Ë F); at the other end of the spectrum, tungsten has the highest melting point of any metal: 3,422Ë C (6,192Ë F). Somewhere in the middle is mercury, which stays in a liquid state until its temperature drops to -40Â°. âA metal is full of bonds between the atoms that make it up,â explains Carter. âWhat determines a materialâs melting point has everything to do with the energy associated with the bonds.