A Purdue University professor of mechanical engineering（机械工程）and his students have created the whitest paint on record. When Purdue University researchers set out to develop a new paint, the goal was to create one that would reflect（反射）sunlight away from a building. It turns out they also set a Guinness World Record（吉尼斯世界纪录）for the whitest paint on the planet. "When we started this project about seven years ago, we had saving energy and fighting against climate change in mind." Professor Xiulin Ruan said.
The paint reflects 98. 1% of solar radiation（太阳辐射）while also giving out infrared（红外线的）heat. Because the paint takes in less heat form the sun than it gives out, a surface（表面） painted with this paint is cooled below the surrounding（周围的）temperature without using power.
Common white paints get warmer rather than cooler. Paints on the market that are designed to reject heat reflect only 80%-90% of sunlight and can't make surfaces cooler than their surroundings.
Searchers did an outdoor test with a surrounding temperature of 43 degrees fahrenheit （Hua's degree centigrade） . The paint made the sample temperature lower by an additional 18 degrees. "That's more powerful than the air conditioners used by most houses, "Ruan said.
Sue said it has been already applied for the patent and researchers are working with a company to put the paint on the market.
