When heated body expands, and Vice versa – these can be found even in the school textbook of physics. The atmospheric air obeys the same laws. When heated by the sun it expands, its warm streams rise up, the pressure drops. When cold the air is, by contrast, is compressed, becomes denser, and pressure increases. The magnitude of the atmospheric pressure affects the height of the terrain above sea level. The higher it is, the lower the reading of the barometer. With increasing altitude drops and temperatures.
The pressure drop, as its increase leads to the appearance of the wind, as the flow of air rushes from areas of high pressure to areas of low. This, in turn, causes a change in the weather. The decrease in pressure usually means that the weather will soon spoil. Conversely, its increase with the rainy weather signals the imminent clarification. Why is it so? When the barometer is falling, begins to receive air from areas with higher pressure, bringing the clouds. When barometer readings are rising, the air begins to spread in the area with lower pressure, carrying with it the atmospheric moisture.
Go on a hot summer day on the beach. Where the wind blows? From sea to land. Why? Because the soil heats up faster than water (land-less), it warms up and rises warm air, pressure decreases. In its place from the sea come the cooler, denser air. Night the opposite is true: the heat of the day the sea gives up its heat to the air, it flows, rises, replaced by cool air from the shore.
More influence on the weather, have the cyclones and the anticyclones. The cyclone is characterized by reduced air pressure and the vortex motion in a counterclockwise direction. The anticyclone all the way around - clockwise motion, the pressure is high. Cyclone is always accompanied by strong winds, the anticyclone is calm or weak winds. Cyclone brings rain and snowfall, high – stable clear weather.
Advice 2 : How does the temperature of the pressure
Temperature (t) and pressure (P) – two interrelated physical quantities. Evident is the correlation in all three States of aggregation of substances. From fluctuations of these quantities depends on most natural phenomena.
A very close relationship between the liquid temperature and atmospheric pressure. In any liquid there are many small air bubbles having its internal pressure. When heated, these bubbles evaporate saturated vapor of the surrounding liquid. All this continues until, until the internal pressure equals the external (atmospheric). Then, the bubbles can burst – is a process called boiling.
A similar process occurs in solids during melting or during the reverse process of crystallization. Solid body consists of crystal lattices, crush that can, if the distance of the atoms from each other. Pressure increases, it acts in the opposite direction pushes the atoms towards each other. Accordingly, in order for the body melted, requires more energy and the temperature rises.
The equation of Clapeyron-Mendeleev describes the temperature dependence of the pressure in the gas. The formula is: PV = nRT. R – the gas pressure in the vessel. Since n and R are constants, it is clear that the pressure is proportional to the temperature (at V=const). This means that the higher R, the higher t. This process is due to the fact that when heated, intermolecular space is increased, and the molecules begin to move rapidly in a chaotic manner, and therefore often hit the wall of the vessel containing the gas. The temperature in the equation of Clapeyron-Mendeleev usually measured in degrees Kelvin.
There is the concept of standard temperature and pressure: temperature is equal to -273° Kelvin (0 °C) and pressure of 760 mm Hg.
Ice has a high specific heat capacity equal to 335 kJ/kg. Therefore, in order to melt, you need to spend a lot of thermal energy. For comparison, the same amount of energy to heat the water to 80 °C.