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Is Your Greenhouse Ready To Go?

By Jimmy Woodall

Republish: EasyPublish™ Published: 31Oct2009 Word count: 401 Viewed: 177 time(s) Get Free Content For Your Site

Greenhouses are usually built of glass, plastic, or a plastic-type material. It heats up mainly because the sun warms the ground inside it, which then warms the air in the greenhouse.

The air continues to heat because it is confined within the greenhouse, unlike the environment outside the greenhouse where warm air near the surface rises and mixes with cooler air aloft.

This can be demonstrated by opening a small window near the roof of a greenhouse: the temperature will drop considerably. It has also been demonstrated experimentally that a "greenhouse" with a cover of rock salt heats up an enclosure similarly to one with a glass cover.

A greenhouse is the suppression of convection (the exchange of air between the inside and outside). Thus, a real greenhouse does act like a blanket to prevent bubbles of warm air from being carried away from the surface.

As we have seen, this is not how the atmosphere keeps the earth's surface warm. Indeed, the atmosphere facilitates rather than suppresses convection.

One sometimes hears the comparison between the greenhouse effect in the atmosphere (not in real greenhouses) and the interior of a parked car which has been left in the summer sun with its windows rolled up.

This comparison is as phony as is the comparison to real greenhouses. Again, keeping the windows closed merely suppresses convection. Whether the topic is a real greenhouse or a car, one still hears the old saw that each stays warm because visible radiation (light) can pass through the windows, and infrared radiation cannot.

Actually, it has been known for the better part of a century that this has very little bearing on the issue. Greenhouse is one step closer to Devon island. Mars on earth: the nasa Haughton-mars project.

A greenhouse is one of the best parts of greenhouse gardening for working with shade cloths, earth boxes, cold frames, and greenhouses can greatly improve your chances.

A greenhouse is built against a building, using the existing structure for one or more of its sides. It is usually secured to a house, but may be attached to other buildings.

The greenhouse is limited to single or double-row plant benches with a total width of 7 to 12 feet. It can be as long as the building to which it is attached. The advantage of the lean-to greenhouse is that it usually is close to available electricity, water, and heat.

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