Another consideration is the relationship. between insulation class, temperature rise, and ambient temperature. The insulation. class rating designates the maximum. operating temperature for a winding. The. temperature rise is the difference between the.
China claims it has discovered the world's largest hole, and it's in one of the most dangerous places on the planet. 1  Jul.  Good news: China claims it has discovered the world's largest hole. On Wednesday, state broadcaster CCTV announced that the newly found dragon's hole, a 984-foot (300-meter) cavern in the disputed waters of the South China Sea, is now the world's largest hole.
The Antarctic ozone hole reached its annual peak size on Sept. 11, 2014 according to scientists from NASA and the National Oceanic and Atmospheric Administration (NOAA). The size of this yearâs hole was 24.1 million square kilometers (9.3 million square miles) â an area roughly the size of North America.