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[[image:800px-Dry_Ice_Sublimation_1.jpg width="211" height="122" align="right"]]
=Fragrant CO2=

Introduction-
Basically, when we were coming up with ideas for science projects, I decided I wanted to do something with dry ice. That day I was wearing my favorite fragrance so I thought, Why not make an air freshener using dry ice? It puts off fumes, so it must put off smell right? So I started researching for it, and found out it might be possible! So I asked my teacher right away if I could do this project and she loved it! It may not be the safest air freshener, but it’s cool, and it’s unique.

Hypothesis-
My hypothesis is that by adding different fragrances to dry ice, it will create a sweet smelling scent.

Materials-
1 Orange Berry or flower scented cones Vanilla beans Cinnamon Dry Ice Tongs Gloves Bowls

Method-
1) Get out Everything you Need 2) Separate Dry Ice into different bowls, 1 bowl for every fragrance 3) In the bowls with the dry ice set your fragrance 4) Wait for 10 minutes 5) Go over and quickly sniff the dry ice 6)Write down you results like this, Strong, No smell, faint smell, etc. 7)Repeat steps 4-6 until an hour has past (You may need to add more dry ice to the bowls) 8) After the hour is up go over and pick up the dry ice (with gloves) and sniff it while holding it 9) Gather your results

Conclusion-
My conclusion is that, it was a success. Because when I actually picked up the dry ice and when it was in the bowl, you could smell the fragrance. Though I believe if I did it for more than one hour, I would have even better results. The strongest one out of the four fragrances was the flower scones.

Background Research-
Fragrances- Flower fragrances are stronger at certain times during the day or night. Studies show that Air pollution destroys flower fragrances.

Dry Ice- Dry ice is colorless, odorless, and non-flammable. It's a solid form of CO2 Dry ice can be used to preserve food. When it is placed in water, clouds of fog are created. Instead of melting, it turns into gas. The temperature of dry ice is around -108 degrees Fahrenheit. Carbon Dioxide is about .04% of our atmosphere. Adding liquids to dry ice makes them bubble

Safety: Make sure the room is well ventilated Wear Insulated gloves Pick up the dry Ice with Tongs or Insulated gloves, never with bare hands.

Other Facts- They make scents to pour into fog machines to make smells.

Vanilla- It takes around 10 months for a Vanilla Plant to be fully grown. Each Bean ripens at it's own time, thus causing for a daily harvest of beans. Vanilla is used in some medicines.

Orange- It is a Citrus Fruit. It has a pH level of around 2.5-3. Brazil is a leading citrus producer.

Cinnamon- The spice is obtained from The tree bark. Cinnamon is a small evergreen tree. It is native to Sri Lanka.

Lilac- They are a deciduous shrub. The flower is produced in the spring. Lilac is a commonly used fragrance.

Questions for further Study-
Is there anyway to make a safer version of this experiment?

Can you use liquids instead of solids to make an air freshener?

References-
Yaws, Carl (2001). Matheson gas data book (7th ed.). McGraw-Hill Professional. pp. 982. http://books.google.co.uk/books?id=Sfvbgvu9OQMC.

"Dry ice pops off Asphalt Tile". Popular Mechanics 115 (2): 169. February 1961.

"Dry Ice." National Weather Service - Western Region Headquarters. N.p., n.d. Web. 11 Jan. 2010. .

"Dry Ice: Simply Sublime." Dry Ice: Simply Sublime. N.p., n.d. Web. 11 Jan. 2010. .

Anilkumar, A. S., 2004. Vanilla cultivation: A profitable agriculture-based enterprise. Kerala Calling, February, pages 26 to 30.

Davis E. W., 1983. Experiences with growing vanilla (Vanilla planifolia). Acta Horticulturae, 132:23-29.

George, P. S., Ravishankar, G. P., 1997. In vitro multiplication of Vanilla planifolia using axillary bud explants. Plant cell reports, 16:490-494.

"Food and Agriculture Organization of the UK." FAO: FAO Home. N.p., n.d. Web. 12 Jan. 2010. .

Cinnamon". Encyclopaedia Britannica. 2008. "

Huxley, A., ed. (1992). New RHS Dictionary of Gardening.

" Flowers And Fragrances - The Flower Expert - Flowers Encyclopedia.." Flowers | The Flower Expert - Flowers Encyclopedia. N.p., n.d. Web. 12 Jan. 2010. .

University of Virginia. "Flowers' fragrance diminished by air pollution, study indicates." PhysOrg.com - Science News, Technology, Physics, Nanotechnology, Space Science, Earth Science, Medicine. N.p., n.d. Web. 12 Jan. 2010. .