Fluids

• What is the definition of a fluid?


  Fluids are substances that can flow and change shape when a force is applied.
• What are the two main types of fluids?


  Liquids and gases.
• What is a key characteristic of fluids?


  Fluids cannot maintain a fixed shape and will conform to the shape of their container.
• Can some solids be considered fluids? Give an example.


  Yes, examples include sand or grain, which can flow.
• How is density defined in the context of fluids?


  Density is defined as the mass per unit volume of a substance.
• What is the formula to calculate density?

  Density = Mass / Volume.
• What is the typical density of water at room temperature?


  1000 kg/m³.
• How does density change with temperature and pressure?


  Density can change with temperature and pressure.
• If a fluid has a mass of 500 grams and occupies a volume of 400 cm³, what is its density in g/cm³?


  1. 25 g/cm³.
• What is compressibility in the context of fluids?


  Compressibility is a measure of how much a fluid's volume changes when pressure is applied.
• How do gases and liquids differ in terms of compressibility?


  Gases are highly compressible, while liquids are generally considered incompressible.
• Why are liquids often treated as incompressible in engineering?


  Because they resist volume changes under normal pressures.
• If you have two identical glasses, one filled with water and one with honey, what would you expect to observe when tilted?


  The water will flow out quickly, while the honey will flow out slowly.