Unit 3 lec 7- Density and Convection

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Presentation transcript:

Unit 3 lec 7- Density and Convection Image credit: Wikimedia Commons; https://commons.wikimedia.org/wiki/File:ConvectionCells.svg (CC BY-SA 3.0)

Density is a measure of how tightly packed the molecules of a substance are. Imagine that each  is a molecule. Label the following boxes in order from least dense (1) to most dense (3)

One thing that we know about density is that substances, that are less dense will float in substances that are more dense. What can you tell us about the density of water, alcohol, & ice cubes? Ice is (more/less) dense than liquid water? (circle one) Ice is (more/less) dense than rubbing alcohol (circle one) Liquid water is (more/less) dense that rubbing alcohol? (circle one) Place in order of increasing density: ______________ < _________________ < ________________

Density is a derived unit (from mass and volume) To measure density we use an equation Density = Mass Volume D = g/ml or D = g/cm3 Density is a derived unit (from mass and volume) Density is an intensive property (independent of amount)

Examples: An object has a mass of 5.0 g and occupies a volume of 15ml, what is its density? D= m v D = 5g 15ml D= 1 g/ml 3 D= .33 g/ml

2. Are gases more or less dense than liquids/solids at room temperature? Based on your everyday experiences, how do you know?

Conduction Review Exchange of heat by direct contact Air warmed on the pavement Making popcorn on the stove Meat on a frying pan The teacher will state that the picture represents conduction: the pancakes are receiving direct heat from the skillet. Image credit: Alyss, Flickr; https://www.flickr.com/photos/alyssssyla/3361571920 (CC BY-NC-SA 2.0)

Convection Convection: Transfer of heat in fluids (liquids and gases) through rising and falling currents Warm air rises causing cold air to come in= wind Water molecules rising and falling when water boils in a pot https://www.youtube.com/watch?v=VxGIiOTuAIs The teacher can show this slide to assist the students will completing the chart in slide 7.

Convection- model convection in a lava lamp https://www. youtube The teacher will explain the mobility of the particles in the transfer of heat. Hot water rises and cold water sinks—or in the case of lava lamps, the hot “lava” rises from the bottom and falls from the top as it cools. Image Credit: PacoScott, Flickr; https://www.flickr.com/photos/ttocsland/548316147/in/photostream/ (CC BY-NC 2.0)

Lava Lamp

How do they make lava lamps (start at 1:50)

https://www.youtube.com/watch?v=DL3Ez9bxMTo

https://www.youtube.com/watch?v=3AtBTP0Hf4g

Explore Activity Can you explain what happened in the explore activity now? https://www.youtube.com/watch?v=B8H06ZA2xmo