Recent content by ztdep

I am evaluating this formula, it's real value is 0. but maple can't further simplify it?

Thank you very much for your answer. I suddenly feel refreshed.

you mean the momentumr transport of molecules is balanced with weight

We often say the pressure of air is caused by the air column above the surface. Obviously, it will not work for the case of air in an enclosing box. The pressure is caused by the air moleculars striking on the box surface. But if we replace air with water. we can explain it sucessfully again...

Dear friends: Put a big disk in the space which can rotate at a speed. for example, if the radius of the disk is 10000km, and it rotates at a speed of 30 rad/s, then the speed at the disk boundary is 30,0000km/s. am i right?

If you put a constant force on a object siting on the ground, it may not move because your force is not big enough.

since water can turn into steam at any temperature, what is the latent heat of water evaporation. I know the late heat value at the boiling point. but what is the latent heat at 20 Celsius

I think the pressure is caused by both the weight and the collision force.

I think the pressure is caused by both the weight and the collision force.

Dear friends: The pressure is generated by the molecular collision or the weight of the air.?

remove the ellipticity of the equations, thus allowing the use of explicit schemes. the e is a large number, it takes finite values which can be determined through numerical experimentation.