5b-Density and pressure Flashcards
What is density?
A: Density is the mass per unit volume of a substance.
What does density depend on?
A:
Material composition: Different materials have different densities.
State of matter: Solids are generally denser than liquids and gases.
Q: How can density be measured for regular and irregular objects?A:
Regular objects (e.g., cube, cylinder):
Regular objects (e.g., cube, cylinder):
Measure mass using a balance.
Measure volume using a ruler and calculate using geometric formulas.
Use .
Q: How can density be measured for regular and irregular objects?A:
Irregular objects:
Measure mass using a balance.
Measure volume using the water displacement method in a measuring cylinder.
Use : p= m/v
How can the density of a liquid be measured?A:
Measure mass of an empty measuring cylinder.
Add liquid and measure total mass.
Subtract to find the mass of the liquid.
Measure volume using the cylinder.
Use : p= m/v
Q: What is pressure?
A: Pressure is the force exerted per unit area.
How does pressure behave in gases and liquids at rest?A:
Pressure acts equally in all directions in a gas or liquid at rest.
Pressure increases with depth in a liquid.
Practical: Investigating Pressure in Liquids
Measuring Pressure with a Manometer
Method: Use a manometer to measure pressure in different depths of liquid.
Observation: Pressure increases with depth.
Conclusion: Confirms P=hpg
Practical: Investigating Pressure in Liquids
Investigating Pressure in Gases
Method: Use a sealed syringe and apply different forces.
Observation: As volume decreases, pressure increases.
Conclusion: Shows pressure acts equally in all directions in a gas.
