The gas desorption laws of coal mass were studied at three different temperatures.The results showed that the gas desorption speed gradually slowed down with time.The law of gas desorption at constant temperature after freezing was similar to that at ambient temperature.The difference was less gas desorbed.The gas quantity desorbed at variable temperatures after freezing was linear to square root of desorption time,indicating that the desorption speed at lower temperature was slower than that at ambient and...