Organization of 4H Module

• Brief Introduction and handouts (~30 min)– Module Description– Worksheet- please return at the end of the

module

• Lab section in room 162 (~2.5 h) – Five Groups

• Recap (~15 min)

4H moduleA Mars Greenhouse

Prepared by: Hemant Gohil, John Truett, Alex Stimpson,Dr. Ray Bucklin and Dr. Melanie Correll

Mars in the Solar System

http://scienceclass.ning.com/

Earth

Phoenix Mars Lander: Water on Mars

(Artist conception) Phoenix Mission, University of Arizona

Image credit: NASA/JPL-Caltech/University of Arizona/Texas A&M University

Atmosphere of Earth and Mars

http://www.spacegarden.net/documents/Plants%20in%20Space%20Introduction%20Presentation.pdf

Plant – Water-Gas – Human Interactions

http://www.nasa.gov/images/content/138008main_jsc2005e43267_hi.jpg

Wheeler, R.M. 2004. Horticulture for Mars. Acta Hort: 642 ISHS

http://www.nasa.gov/images/content/138008main_jsc2005e43267_hi.jpg

PRESSURIZED MARS GREENHOUSE

PRESSURIZED GROWTH CHAMBER UNDERGROUND

NASA MARS SURFACE GREENHOUSE DOME

(low pressure)

http://science.ksc.nasa.gov/biomed/marsdome/DOMEPIC4.GIF

http://adamstuart.blogspot.com/2007_05_01_archive.html

UF Mars Greenhouses

Activities1. Assembling a Low Pressure Growth Chamber.

2. Uploading of the software program to the computer that monitors sensor outputs.

3. Programming the Temperature sensor – converting °C to °F.

4. Studying the effect of Low Pressure on Gas dynamics in LPGC.

5. Testing a marshmallow/balloon in low pressure to understand Boyle’s Law.

Activity 1: Assembling a Low Pressure Growth Chamber

COVER

Base12V Power supply

CR10DataloggerO2 Sensor

PRESSURE SENSOR

OXYGEN SENSOR

CARBON DIOXIDE SENSOR

TEMPERATURE SENSOR

4L

Activity 2: Uploading of the software program to the computer that monitors sensor outputs.

Activity 2: Uploading of the software program to the computer that monitors sensor outputs.

Activity 3. Programming the Temperature sensor

°F = °C*1.8 + 32

Step 1: Collect data in °C

Step 3: Take stored value from Step 2 and add 32

Step 2: Multiply data by 1.8 and then store value

Activity 4. Studying the effect of Low

Pressure on Gas dynamics in LPGC Highlight Columns for Time vs. Pressure Figure

Sensors

Vacuum Pump

CLICK THE FIGURE ICONWhile Columns are Highlighted

Select XY Scatter Plot then finish

Final Plot: Sketch line in worksheet, repeat for O2% and CO2 ppm, see other groups if your

group doesn’t have a sensor

Activity 5. Testing a marshmallow and balloon in the LPGC to understand Boyle’s law

Marshmallow Balloon

Boyle’s Law

P1V1 = P2V2

•Balloon test•Marshmallow test (note: use ruler setup to measure height and diameter of marshmallow in the chamber)

Activity 6. Calculating the photosynthetic rates at Low pressure

• 6 CO2 + 12 H2O C6H12O6 + 6 O2 + 6 H2O

LIGHT

HAVE FUN and BE SAFE!

• ASSIGN GROUPS #s