Natural gas flows from a source at 100 bara through 100 m of 0.5-cm ID new commercial steel pipe to atmospheric pressure. The pipe is horizontal. Determine if this flow is choked for the adiabatic and isothermal cases.

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?

The small bags of silica gel you often see in a new shoe box are placed there to control humidity. despite its name, silica gel is a solid. it is a chemically inert, highly porous, amorphous form of sio2. because water vapor readily adsorbs onto the surface of silica gel, it acts as a desiccant. despite not knowing mechanistic details of the adsorption of water onto silica gel, from the information provided you should be able to make an educated guess about the thermodynamic characteristics of the process. predict the signs for δg, δh, and δs for the adsorption of water.

Which of the following words describe the reality that the universe looks the same from various perspective