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# Density practice

What is the density of a rock with a mass of 45g and a volume of 15ml? 3 g/ml
Which would be more dense - a container with 9 atoms and a volume of 1mL or a container with 9 atoms and a volume of 2mL? Container with 9 atoms and a volume of 1 mL
Does hot air/water rise or sink? Why? Hot air/water rises because it is less dense than cold air/water
What causes convection currents to happen? Differences in density - hotter stuff is less dense than colder stuff, therefore hot stuff will rise and cold stuff will sink
Do you think that cold ocean water is more or less dense than warm ocean water? Cold ocean water is more dense - the particles are closer together than hot ocean water
Which is saltier - cold ocean water or hot ocean water? Cold ocean water - when water freezes, the salt gets left behind, making the ocean water in the poles saltier and more dense.
Why does high pressure move to low pressure, causing wind? Because high pressure is air that is more dense. Low pressure is air that is less dense. A low pressure area has more space for air molecules, so the high pressure moves to the low pressure to fill in that space.
What is the formula for density? Density=m/V = mass/volume (mass divided by volume)
What are the units for volume? mL, cm^3, or L
What are the units for mass? g or kg
What are the units for density? g/mL, kg/L, g/cm^3
1 mL = ? 1 cm^3 = 1mL
What is the density of pure water? 1 g/mL
What causes and object to sink or float in water? An object will sink if it is more dense than water (> 1g/mL) and it will float if it is less dense (<1 g/mL)
Created by: mparr01

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