温度升高，气体的无秩序热运动增强，气层之间的加速和阻滞作用跟着增加，内摩擦也就增加。所以，气体的粘度随着温度的升高而加大，与液体的粘度随温度升高而降低不同。随着压力升高，气体的性质逐渐接近液体，温度对粘度的影响，也越来越接近于液体。When the temperature increases, the disorderly thermal motion of gas increases, and the acceleration and retarding between gas layers increase accordingly, and the internal friction also increases. So the viscosity of a gas increases with temperature, not the viscosity of a liquid decreases with temperature. As the pressure increases, the properties of gases become closer to liquids, and the effect of temperature on viscosity becomes closer to liquids.