PhET/C2/The-Greenhouse-Effect/English-timed
From Script | Spoken-Tutorial
| 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 |
