High Pressure
High Pressure
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Kwik Tek Airhead High Pressure Air Pump (12-Volt) List Price: $69.99 Sale Price: $37.69 Average Rating:   |
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AIRHEAD 12 Volt High Pressure Pump - AIRHEAD’s new 12 Volt Hi Pressure Air Pump w/ Pressure Release Valve produces 3 times the pressure of other 12 volt air pumps. Therefore it’s perfect for getting towables, boats and rafts nice and firm for peak performance... |
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Coleman High-Pressure Propane Hose and Adapter List Price: $24.99 Sale Price: $24.99 Average Rating:  |
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Designed for Coleman Road Trip grills and lanterns, this 5-foot hose and adapter offers plenty of reach from cylinder to load. Backed by a Coleman 1-year warranty, this hose is built to last. --Brian Olson |
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Kenda Kwest Commuter/Recumbant Bicycle Tire Average Rating: |
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Smooth rolling tread pattern for street use. Deep grooves for siping water away from the tread in wet conditions. 30 tpi. 50-85 psi. |
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Kwik Tek Airhead Hi Pressure Air Pump with Press Release (120-Volt) List Price: $49.99 Sale Price: $28.97 Average Rating: |
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AIRHEAD® Hi-Pressure Air Pump - This is simply the best performing 120 volt air pump available, inflating and deflating at unprecedented speed. Peak pressure is 2.5 psi, plenty of pressure to get high end inflatable boats, rafts and reinforced backyard items nice and firm... |
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Beto High Pressure Bicycle Floor Pump List Price: $24.99 Sale Price: $19.06 Average Rating:  |
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The Beto High Pressure Floor Bike Pump is designed for use with FV, AV, or DV valve types. This classic style air pump features a double pump head and has a maximum pressure of 160 psi. It is constructed of durable steel and includes a pressure gauge for proper tire inflation. |
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Lezyne Pressure Drive High Pressure Hand Pump List Price: $39.95 Average Rating: |
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Simply mount the Lezyne Pressure Drive High Pressure Hand Pump to your water bottle cage bolts, and you?re ready to roll. This high-pressure hand pump is thirty percent more efficient than conventional hand pumps and fits Presta or Schrader valves... |
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RAVE High Pressure 2.5psi Pump(12 Volt) List Price: $59.99 Sale Price: $33.99 |
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RAVE 12V Hi-Pressure Inflator/Deflator Pump |
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Zephyr Sports 48/3000 Compressed Air Tank List Price: $59.95 |
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Features: Low Pressure Swap Available * Dual safety rupture plugs for both bottle and marker safety * High quality 6000 PSI mini gauge * Durable nickel plated navel brass bonnet * Stainless Steel high pressure fill nipple * Dual locking set screws * DOT and TC Certified "Made in USA Alluminum Cylinder" * 5 year hydro test date * Convert to Low Pressure for $10... |
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Valterra Products, Inc. W01-6300 RV/Marine 25'White High Pressure Drinking Water Hose List Price: $17.05 Sale Price: $15.76 |
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Valterra Products, Inc. White High Pressure Drinking Water Hose - Non-toxic, drinking water safe, made of FDA approved materials.160 PSI working pressure and 340 pounds burst pressure strength for 0.5 inch hoses... |
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Jabsco 9200-0023-P Marine Replacement Impeller (Nitrile, F Silhouette, 3/4" Deep, #4 Single Flat Drive, 5/16" Shaft, 10 Blade, 1 9/16" Diameter, Brass Insert, High Pressure) List Price: $39.99 Sale Price: $22.59 |
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Makes quick, clean and easy oil changes on-board any boat. 14 quart container. Hose - 1/2" ID x 48" long. Probe - 1/4" OD x 40" long. Size: 15-3/8" H x 13-1/2" Diameter. 12 volt dc, fuse 15 amp. |
What causes low air pressure and what causes high air pressure?
So the text book from which I am working from gives me the definition for air pressure but does not explain what high and low pressure are and what causes them. The only thing that it does mention is that low pressure is characterized with poor cloudy weather and high pressure is associated with clear days.
Does it have to do with temperature? I am so confused 
Here it is:
On the first day of creation, God make the atmosphere to be 1013,25 hPa pressure at sea level and 15 degrees Celsius temperature. Then he said that the temperature will sink with 0.65 degrees per 100 meter of altitude. Then he called it the Standard Atmosphere (SA).
On day two, the sun being higher over the equator warmed it up, and the poles cooled down. Warm air being lighter, it rose at the equator, creating a low pressure, and sank at the poles, creating two high pressures. The wind then started blowing from the poles to the equator on the surface, and inversely at altitude.
On the third day, God forgot that the earth had to spin. When it started, the Coriolis effect started to play tricks: in the northern hemisphere, the air from the equator at altitude started turning to the right and fall back in two belts of high pressure, at about 30 degrees north and south of the equator.
But between the sub-tropical high pressures and polar high pressures, a front was created because air of different temperature mix poorly.
Those two fronts are roughly at latitudes 60 north and south. Along them warm air climbs over cold polar air. The uprising causes low pressures.
And that's how the main systems of high and low pressures on earth are working. The equatorial low pressures are responsible for the equatorial rain forest. Then comes sub tropical high pressure with desertic regions, then the frontal lows, then the polar high pressures.
As the air rises in a low pressure, it cools down adiabatically and the moisture has to condense into clouds and rain.
As the air sinks in a high pressure, it warms up adiabatically and the moisture in the clouds evaporate, giving room for a clear sky.
The adiabatic effect is exactly what you have in your frigde: A gas is compressed, giving heat, then released through a nozzle, creating cold.
... this is what I teach to airmen when I teach meteorology. Well ... that's only the first five minutes of a three hours course! 