Final answer:
The design pressure of the low side in systems like refrigeration is determined by the temperature requirements of the medium being cooled, making the statement true. Systemic blood pressure must indeed stay above a certain threshold for proper filtration. A real gas behaves like an ideal gas at high temperature and low pressure.
Step-by-step explanation:
The statement 'The design pressure of the low side is determined by the requirements for the cooled medium' is generally true. In refrigeration and air conditioning systems, the design pressure on the low side, such as in the evaporator, is critically influenced by the temperature requirements of the medium being cooled. The pressure correlates with the refrigerant's boiling point at the desired temperature of the cooled medium. For optimal and efficient cooling, the system must maintain a pressure that allows the refrigerant to absorb heat at the correct temperature.
Systemic blood pressure, as another example of pressure in a system, must stay above 60 mmHg to ensure adequate filtration occurs in the kidneys, highlighting that certain pressures are essential for the correct function of biological systems.
In the case of real gases, the statement that a 'real gas behaves like an ideal gas at high temperature and low pressure' is typically correct. At high temperatures, the kinetic energy of the gas molecules is sufficient to overcome intermolecular forces, and at low pressures, the gas molecules are generally far enough apart that the volume of the individual molecules is negligible compared to the volume of the container.