It is easy to model the greenhouse effect. Take two soda bottles and cut off their tops. You will need two thermometers, masking tape, plastic wrap, scissors, colored pencils, graph paper, dark soil and a sunlamp. Cover the bulbs of the thermometers with cardboard to protect from direct heat. Add 2 cm soil to the bottom of each bottle. Tape a thermometer in each bottle, 2 inches from the top and above the soil surface. Record the temperature of the thermometer in your data table. That is your beginning temperature for each bottle. Next, place plastic wrap over one of the bottles. Tape it shut. The other bottle should be left uncovered. Place both bottles in direct sunlight or under a sunlamp. Measure the temperature every 15 minutes for 1 hour or longer if time permits and record the temperatures in the data table. This is a controlled experiment. Consider what the bottle with the plastic wrap represents and what the uncovered bottle represents! The data table should be time in minutes, versus temperature in degrees Celsius, for the covered and uncovered bottles. When graphing, the X axis is time in minutes and the Y axis is temperature in degrees C. You can graph the data for the covered bottle in one color-red, and the data for the uncovered bottle in a different color-blue. Analyze data for each bottle, graph the results and draw conclusions.
To construct a model,showing green house effect,you have to make a hut like structure using trasparent plane glass sheet.Even base of the hut must be made from glass sheet.Now you have to put a themometer inside the wall of hut,to read temperature inside hut.
Now place the above arrangement outside where sunlight comes directly over it.After an hour note temperature of hut.Now shift your arrangement into room,where temperature is sufficiently low,yow will observe that fall rate of temperature inside the hut is very slow.It is because glass is an adiathermanous material.It prevent radiation to pass out through it.Hence temperature inside the hut remains more than that of room temperature.This shows green house effect.