There is no such thing. There is radon gas, which is a radioactive noble gas. It is given off by some rocks and soil.
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The radian is 0.523598776
1 degree = pi*radian/180 So therefore 15 times pi*radian/180 = pi*radian/12
A radian is an arc of the circumference of a circle and it is about 57.3 degrees.
-1.257 radian
radian = 180/2pi degrees