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Learn about and revise exchange surfaces and transport systems with this BBC Bitesize Combined Science AQA Synergy study guide.
The size of their surface, or surface area, defines how quickly they can absorb substances. The size of their volume defines how much of these substances they need.
- Laminar and Turbulent Flow
- Boundary Layer
- Drag
When you empty water from a plastic bottle, you've probably noticed you can do it in two very differentways. If you tip the bottle at a shallow angle, the water comesout very smoothly; air moves past it, in the opposite direction,filling the bottle with "emptiness." If you tip the bottle more,or hold it vertically, the water comes out noisily, in j...
The speed at which a fluid flows past an object varies according to how far from the object you are. Ifyou're sitting in a parked car and a gale-force wind is howling pastyou at 200km/h (125mph), you might think the difference in speed between theair and the car is 200km/h—and it is! But there's not a sudden,drastic discontinuity between the statio...
Photo: The faster you go, the harder you have to work against the air. Air resistance doesn't really matter when you walk, because you're not traveling fast enough. But if you cycle, you need to think about aerodynamics much more and adopt a streamlined posture that disturbs the airflow as little as possible. Like this rider, you might want to get ...
Air on the surface is pulled towards the poles, forming the warm south-westerly winds in the northern hemisphere and north-westerly winds in the southern hemisphere. These winds pick up...
Air Transportation. Air Transportation refers to the movement of people and goods by air using various means such as major airlines, private jets, and helicopters. It plays a significant role in connecting different locations but can also contribute to noise and air pollution near airports.
Since air is a poor conductor, most energy transfer by conduction occurs right near Earth's surface. Conduction directly affects air temperature only a few centimeters into the atmosphere. During the day, sunlight heats the ground, which in turn heats the air directly above it via conduction.
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Atmosphere - Convection, Circulation, Deflection: The region of greatest solar heating at the surface in the humid tropics corresponds to areas of deep cumulonimbus convection. Cumulonimbus clouds routinely form in the tropics where rising parcels of air are warmer than the surrounding ambient atmosphere.
