Science lab Essay

Submitted By jeevitha98
Words: 870
Pages: 4



Introduction
A greenhouse is a glass building in which plants are grown that need protection from cold weather. The natural level of greenhouse gases in our atmosphere, which keeps the planet about 30ᵒC warmer than it, would otherwise be- essential for life as we know it. Water vapour is the most important component of natural greenhouse effect. Greenhouse gasses are gas that contributes to the greenhouse effect by absorbing infrared radiation. Some of the greenhouse gasses are carbon dioxide, nitrous oxide, and methane. Humans are increasing the amount of greenhouse gasses in the atmosphere by burning natural gas, coal and oil; farming uses and land-use changes, factories producing long- lasting industrial gases, deforestation, population growth and etc.
Purpose
The purpose of this experiment is to demonstrate how greenhouses warm up and stay warm using a model greenhouse. The purpose of this experiment is to also observe the natural greenhouse effect.
Hypothesis
I think that thermometer in the bottle will warm up faster from the lamp than the thermometer outside. The heat from the lamp is going to get trapped inside the bottle and it won’t be able to escape because the plasticine is covering the opening. The thermometer inside the bottle will state that the temperature is continuing to increase. The thermometer outside will continue to stay the same of decrease from the starting number.
Materials
2 digital thermometers
Retort stand
Timer or stopwatch
Plasticine
Clamp
2-L clear plastic bottle
Reflector (heat) lamp




Procedure
1) Carefully wrap one thermometer with plasticine. Fit the plasticine/thermometer assembly into the top of the empty 2-L bottle. The bulb of the thermometer is far down the bottle as possible.
2) The second thermometer was attached to the retort stand with the clamp. The bulb of the thermometer is at about the same height as the one inside the bottle. The thermometer is positioned near the bottle.
3) The heat lamp is positioned so it is at an equal distance from both thermometers. The lamp is not turned on yet.
4) The temperature inside and outside the bottle is recorded for every 15 minutes, in the data table.
5) Record the starting temperatures then turn the lamp on. The temperatures were recorded every minute.
6) When the temperatures stops rising, continue to monitor and record them for another 3-5 min.
7) Clean up the work area.

Observations
Time (min)
Temperature Inside Bottle (ᵒC)
Temperature Outside Bottle(ᵒC)
1
24.4 ᵒC
23.1 ᵒC
2
24.5 ᵒC
23.3 ᵒC
3
24.7 ᵒC
23.2 ᵒC
4
24.9 ᵒC
23.3 ᵒC
5
25.0 ᵒC
23.3 ᵒC
6
25.1 ᵒC
23.4 ᵒC
7
25.1 ᵒC
23.5 ᵒC
8
25.2 ᵒC
23.5 ᵒC
9
25.3 ᵒC
23.6 ᵒC
10
25.3 ᵒC
23.7 ᵒC
11
25.4 ᵒC
23.7 ᵒC
12
25.4 ᵒC
23.6 ᵒC
13
25.4 ᵒC
23.7 ᵒC
14
25.4 ᵒC
23.6 ᵒC
15
25.4 ᵒC
23.5 ᵒC


Analysis and Interpreting
1) Graph your results. Choose a method to distinguish the temperatures inside the bottle from those outside. Explain your method in the legend.



2) Compare the temperature changes inside and outside the bottle. Explain any observed differences.

The changes inside and outside the bottle are very different. The temperature change from inside the bottle is increasing each minute. While the temperature for the thermometer inside the bottle is increasing, the temperature changes for the thermometer outside the bottle is slowly decreasing, increasing, decreasing and finally decreasing.

3) Why was it important to have both thermometers the same distance from the lamp?

It is important to have both thermometers the same distance from the lamp because the data