Difference between revisions of "PhET/C2/The-Greenhouse-Effect/English-timed"

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Revision as of 18:07, 7 August 2018

Time Narration
00:01 Welcome to this tutorial on Greenhouse Effect, an Interactive PhET simulation.
00:07 In this tutorial, we will Demonstrate Greenhouse Effect, using Interactive PhET simulation.
00:14 To follow this tutorial you should have knowledge of High School Science.
00:20 Here I am using- Ubuntu Linux OS version 14.04
00:26 Java version 1.7.0
00:30 Firefox Web Browser version 53.02.2.
00:36 Using this simulation students will learn,

1. Effect of greenhouse gases on atmospheric temperature.

00:44 2. Explore and compare the atmosphere of Ice age and Today.
00:49 3. Effect of Glass panes and Clouds on atmospheric temperature.
00:55 4. Interaction of photons with atmospheric gases.
00:59 5. Contribution of atmospheric gases to Greenhouse Effect.
01:04 Greenhouse Effect

It is a phenomenon in which, earth's atmosphere traps radiation emitted by sun.

01:13 This effect is caused by gases in the atmosphere.
01:17 They retain the heat radiated back from earth's surface.
01:22 This slide shows greenhouse gases and their percentages.
01:27 This process is similar to what happens inside a Greenhouse.
01:32 In cold places, fruits and vegetables are grown in glass covered area called a Greenhouse.
01:40 In a Greenhouse, solar radiations pass through the transparent glass and heat up the soil.
01:47 Some of this heat is absorbed by the glass and some is reflected.
01:52 This mechanism keeps the energy of the sun trapped in the Greenhouse.
01:58 Use the following link to download the simulation.
02:02 I have already downloaded the Greenhouse Effect simulation to my Downloads folder.
02:08 I will open the simulation using the terminal.
02:12 Open the terminal.
02:14 At the prompt type cd Downloads and press enter.
02:20 Then type, java space hyphen jar space greenhouse_en.jar and press enter.
02:31 Greenhouse Effect simulation opens.
02:35 The simulation has 3 screens,

Greenhouse Effect

Glass Layers and

Photon Absorption.

02:45 Greenhouse Effect screen shows Earth's atmosphere.
02:49 Light from Sun is depicted as yellow photons.
02:54 The radiated heat from Earth's surface is shown as red infrared photons.
03:00 On the right-hand side panel, we have options to explore the atmosphere.
03:06 By default Atmosphere during is set as Today.
03:11 Observe the composition of greenhouse gases for Today's Atmosphere.
03:16 There is a thermometer to record the temperature in Kelvin and Fahrenheit scales.
03:23 Options panel has radio buttons to display temperature in, Fahrenheit or Celsius units.
03:31 At the bottom of the screen there are buttons to Pause and Play simulation.
03:37 Drag the slider to change the speed of the animation from fast to slow.
03:44 Observe the temperature on the thermometer.
03:48 Click on Adjustable concentration button.
03:52 It will increase the concentration of greenhouse gases.
03:57 Then drag the Greenhouse Gas Concentration slider towards Lots .
04:03 Observe the temperature on the thermometer.
04:07 As the concentration of greenhouse gases increases, temperature increases.
04:13 Does clouds in atmosphere help in reducing the Greenhouse Effect?
04:18 Add Clouds to the simulation from the Options menu.
04:23 Observe the temperature. Note that, Clouds will help the atmosphere, to retain heat.
04:30 You can also compare the atmosphere during 18th century and Ice age.
04:36 Click on 1750 radio button.
04:40 Note the composition of greenhouse gases.
04:44 Click on Ice age radio button.
04:47 Note the change in composition of greenhouse gases.
04:52 Percentage composition of greenhouse gases in Ice age is much lower.
04:58 Click on Reset All button at the bottom of the screen to reset the simulation.
05:04 Click on Yes to confirm your action.
05:08 Now let us explore other screens in this window.
05:13 Click on Glass Layers tab.
05:16 Here, we have an option to add Glass Panes to the simulation.
05:22 This helps to understand the effect of Glass Panes on atmospheric temperature.
05:28 Let us add a Glass Pane and observe the change in temperature.
05:33 Add more Glass Panes and see what happens.
05:38 Click on Photon Absorption tab.
05:41 Drag the Infrared Photon slider to release the photons.
05:46 Click on Atmospheric Gases radio buttons, one by one and check the vibrations.
06:00 Click on Build Atmosphere radio button.
06:04 Drag the sliders for the respective atoms.
06:19 Then drag the slider for releasing Infrared or Visible Photons.
06:25 Observe the vibrations of the molecules.
06:29 Let us summarize.
06:31 In this tutorial we have learnt, About the effect of greenhouse gases on atmospheric temperature.
06:38 Compared the atmosphere of Ice age and Today.
06:43 Effect of Glass panes and Clouds on atmospheric temperature.
06:48 Interaction of photons with atmospheric gases.
06:52 Contribution of atmospheric gases to Greenhouse Effect.
06:57 As an assignment, Compare atmospheric temperature during 18th century and Ice age.
07:05 Add Clouds to the simulation and observe the changes in the temperature.
07:11 Explore Glass layers and Photon Absorption screens.
07:16 Explain why Glass panes increase the temperature of the atmosphere.
07:22 The video at the following link summarizes the Spoken Tutorial project.

Please download and watch it.

07:31 The Spoken Tutorial Project team: conducts workshops using spoken tutorials and

gives certificates on passing online tests.

07:41 For more details, please write to us.
07:45 Please post your timed queries on this forum.
07:49 This project is partially funded by Pandit Madan Mohan Malaviya National Mission on Teachers and Teaching.
07:57 Spoken Tutorial Project is funded by NMEICT, MHRD, Government of India.

More information on this mission is available at this link.

08:09 This tutorial is contributed by Snehalatha Kaliappan and Meenal Ghoderao from IIT-Bombay.

Thank you for joining

Contributors and Content Editors

PoojaMoolya, Sandhya.np14, Snehalathak