求翻译：与表面直接接触的流体由于导热而被加热，变轻，并且由于与相邻流体的密度差而上升。这种运动由于流体粘性而受到阻碍。是什么意思？

Direct contact with the surface of the fluid is heated as heat, lighter, and because the density difference between the fluid and the adjacent rise. This movement have been hampered due to fluid viscosity.

Direct contact with the surface of the fluid is heated, and change the thermal conductivity of light, and as a result of the adjacent fluid density rates increase. This movement was hampered by fluid viscosity.

Is heated up with the superficial direct contact fluid as a result of the heat conduction, changes light, and as a result of rises with the neighboring fluid density contrast.This kind of movement receives the hindrance as a result of the fluid coherency.

Direct contact with the surface of the fluid by heat due to thermal conductivity, light, and because of the adjacent fluid density difference grew. This movement was hampered due to the fluid viscosity.

Surface direct contact fluid is heated due to thermal conductivity, light and increased because the adjacent fluid density difference. Fluid viscous hindered in this movement because.