Final answer:
The exact minimum oil pressure for the N901-N905 Model is not provided, however, motor oil (SAE 10) is indicated to have a pressure of 30 psi at 20°C. For specific machinery, one should consult the technical manual or manufacturer. Assessing pressure changes in hydraulics or due to temperature involves fluid mechanics and gas laws.
Step-by-step explanation:
The minimum oil pressure for the N901-N905 Model is not explicitly provided in the given information. However, to answer a related question about oil pressure in general, let's consider the given data about various substances at 20°C. The oil pressure for motor oil (SAE 10) is 30 psi, which may be indicative of other heavy machinery oils' pressures. Typically for such machinery, maintaining adequate oil pressure is crucial for proper lubrication and operation.
The minimum oil pressure required for an engine or machine varies depending on the specific model and manufacturer's specifications. It's always best to reference the technical manual or consult the manufacturer for the exact minimum oil pressure for a particular model, such as the N901-N905.
Concerning the other provided information that requires calculations, such as gauge pressure changes due to temperature variations or volume changes in a hydraulic press, these can be calculated using physical formulas related to the properties of gases and hydraulics. For example, the gauge pressure change due to temperature can be assessed using the ideal gas law, while the bulk strain and volume decrease in a hydraulic press typically involve principles of fluid mechanics.