Atmospheric pressure

Atmospheric pressure, sometimes also called barometric pressure, is the pressure exerted by the weight of air in the atmosphere of Earth (or that of another planet). In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point. Low-pressure areas have less atmospheric mass above their location, whereas high-pressure areas have more atmospheric mass above their location. Likewise, as elevation increases, there is less overlying atmospheric mass, so that atmospheric pressure decreases with increasing elevation. On average, a column of air one square centimeter in cross-section, measured from sea level to the top of the atmosphere, has a mass of about 1.03 kg and weight of about 10.1 N (2.28 lb_f) That force over one square centimeter is a pressure of 10.1 N/cm² or 101000 N/m². (A column one square inch in cross-section would have a weight of about 14.7 lbs, or about 65.4 N.).

Standard atmosphere

Sea level

Sea level is generally used to refer to mean sea level (MSL), an average level for the surface of one or more of Earth's oceans from which heights such as elevations may be measured. MSL is a type of vertical datum – a standardised geodetic reference point – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured in order to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is the midpoint between a mean low and mean high tide at a particular location.

Sea levels can be affected by many factors and are known to have varied greatly over geological time scales. The careful measurement of variations in MSL can offer insights into ongoing climate change, and sea level rise has been widely quoted as evidence of ongoing global warming.

The term above sea level generally refers to above mean sea level (AMSL).

Sea level (disambiguation)

Sea level can refer to:

SeeFood

SeeFood (Also known as Sea Level in USA) is Malaysia's first 3D animated movie in English. The film is produced by Silver Ant and released in Malaysian cinemas beginning 8 March 2012.

SeeFood was first launched in Poland on 7 October 2011. It received financial support from Ministry of Science, Technology and Innovation (Malaysia) (MOSTI) and also Multimedia Development Corporation (MDeC).

Storyline

It starts with Julius, a large shark, chasing Pup, but then we see that he was only pretending to hunt him. They come upon and speak about the amazing number of shark egg sacks lying on Pup's reef. Later, while Julius is off chasing a school of fish, two human divers suddenly appear to steal the shark egg sacks from the reef. Pup does everything he can to fend them off; almost being captured himself, but in the end the divers speed back to shore with all the eggs.

In the next scene, which begins with a factory polluting the ocean, Myrtle, a sea turtle, suffocating from a plastic bag around her head, but she finally frees herself of it. The bag drops further down to where Spin, a stingray, was swimming around and he later grab a discarded restaurant menu with his tail. Later on, he throw it to Julius's three pilot fish servants who will open the menu and show him there are other varieties of food, especially chickens, which are only found on land. But this is actually a plan of Spin and Myrtle to get rid of Julius. She and the fish bring him to a nearby beach, where Julius tries to eat a hen called Heather. He's nearly stranded on the land, but is able to make it back into the water.