Hot air expands demonstration Follow FizzicsEd 150 Science Experiments: Comments 0 You will need: Hot water from a kettle or thermos CAUTION: adults to use this only! A glass bottle A balloon A tall plastic container Copyright Instruction 1 Attach your balloon onto your glass bottle. 2 Place your glass bottle into the large plastic cup. 3 Carefully pour the hot water over the neck of the glass bottle. You should start to see the balloon start to inflate. CAUTION: adults to use this only! 4 Keep going until the balloon is inflated as per the picture! Try placing the bottle into cold water… what happens to the inflated balloon now? 5 School science visits since 2004! – Curriculum-linked & award-winning incursions. – Over 40 primary & high school programs to choose from. – Designed by experienced educators. – Over 2 million students reached. – Face to face incursions & online programs available. – Early learning centre visits too! 6 Online courses for teachers & parents – Help students learn how science really works 7 Get the Unit of Work on Heat Energy here! What actually is heat? How does heat move through different materials? How does heat change the properties of materials and more! Includes cross-curricular teaching ideas, student quizzes, a sample marking rubric, scope & sequences & more What is going on? Hot gases expand, cold gases contract! All gases have freely moving molecules. As you add more heat to a gas, the molecules move faster and push harder against the sides of a vessel that holds them. The more the gas molecules collide against the sides of the vessel, the greater the air pressure. By covering the glass bottle in hot water, the heat energy moved into the contained air which then increased the air molecules movement inside the bottle and therefore the air pressure as well. This increased air pressure expanded the balloon! Variable testing More about variable testing here Try different size balloons. Can you inflate each one? With an adult, try different water temperatures Try different shaped bottles Going further What you have observed is an example of how the pressure of a gas is proportional to the temperature of the gas. In simple terms, this means that if you increase the pressure, you increase the temperature. This works both ways, if you increase the temperature, you increase the pressure! This is Gay Lussac’s Law, stated more precisely as below: The pressure of a given mass of gas varies directly with the absolute temperature of the gas, when the volume is kept constan which can be written mathematically as follows: whereby: P1 = Initial pressure T1 = Initial temperature P2 = Final pressure T1 = Final temperature You can explore the effect of changing temperature, volume & pressure in the interactive simulation by the University of Colarado Boulder PhET Interactive Simulations project Just click on “Ideal” which refers to what happens to an Ideal Gas, which is a pretend gas which has molecules that don’t chemically react with each other. This means that you can see what happens to these molecules as you change the temperature, pressure and volume of the container much more easily. Learn more! Hot & Cold Workshop Years 1 to 6 Maximum 30 students School workshop (NSW & VIC) 60 or 90 minutes Online Class Available Read More Enquire Now Liquid Nitrogen Show Years K to 6 Maximum 60 students Science show 45 minutes Online Class Available Read More Enquire Now STEM Full Day Accelerator - Primary Designed from real classroom experiences, this modular day helps you create consistently effective science learning that directly address the new curriculum with easily accessible and cost-effective materials. Read More Enquire Now Liquifly water rocket $31.95 inc. GST View Details Add to Cart Trustpilot
Carefully pour the hot water over the neck of the glass bottle. You should start to see the balloon start to inflate. CAUTION: adults to use this only!
Keep going until the balloon is inflated as per the picture! Try placing the bottle into cold water… what happens to the inflated balloon now?
School science visits since 2004! – Curriculum-linked & award-winning incursions. – Over 40 primary & high school programs to choose from. – Designed by experienced educators. – Over 2 million students reached. – Face to face incursions & online programs available. – Early learning centre visits too!
Get the Unit of Work on Heat Energy here! What actually is heat? How does heat move through different materials? How does heat change the properties of materials and more! Includes cross-curricular teaching ideas, student quizzes, a sample marking rubric, scope & sequences & more
Hot & Cold Workshop Years 1 to 6 Maximum 30 students School workshop (NSW & VIC) 60 or 90 minutes Online Class Available Read More Enquire Now
Liquid Nitrogen Show Years K to 6 Maximum 60 students Science show 45 minutes Online Class Available Read More Enquire Now
STEM Full Day Accelerator - Primary Designed from real classroom experiences, this modular day helps you create consistently effective science learning that directly address the new curriculum with easily accessible and cost-effective materials. Read More Enquire Now
Designed from real classroom experiences, this modular day helps you create consistently effective science learning that directly address the new curriculum with easily accessible and cost-effective materials.
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