Complete the lab and then answer the following questions. 1. In which box did the temperature rise faster?
2. In which box did the temperature rise higher?
3. How did the temperatures in the boxes change after removing them from the sunlight?
4. How does this experiment demonstrate the greenhouse effect?
5. What does each item used in the experiment represent in the actual greenhouse effect on Earth? For
instance, the light used in the experiment represents the Sun. What does the bottom of the box, air in
the box, and plastic wrap each represent in the greenhouse effect?
6. If you can, compare your results with another student and explain the differences or similarities in
your findings.
7. What did you learn from this investigation?

Why do electron microscopes have higher resolving power than light microscopes?

As part of an industrial process, air as an ideal gas at 10 bar, 400k expands at steady state through a valve to a pressure of 4 bar. the mass flow rate of air is 0.5 kg/s. the air then passes through a heat exchanger where it is cooled to a temperature of 295k with negligible change in pressure. the valve can be modeled as a throttling process, and kinetic and potential energy effects can be neglected. (a) for a control volume enclosing the valve and heat exchanger and enough of the local surroundings that the heat transfer occurs at the ambient temperature of 295 k, determine the rate of entropy production, in kw/k. (b) if the expansion valve were replaced by an adiabatic turbine operating isentropically, what would be the entropy production? compare the results of parts (a) and (b) and discuss.

The freezing and boiling point of a substance changes as the air pressure around it changes. for example, at a lower air pressure (higher altitude) it is easier for water molecules to escape from liquid into the air. in a high altitude city such as denver, colorado compared to a sea-level city such as houston, texas, water