The excess pressure, in turn, determines the flow rate of the drug through the nebulizer: the lower it is, the less the drug goes into the aerosol. In short, the substance is supplied unevenly from such a vessel: either thick or empty. Usually, in order to achieve uniform fluid flow, they resort to various kinds of technical tricks. In aerosol packages, constant overpressure and uniform consumption of the drug are ensured in an original way. It's all about the propellant. It is not so easy to find the necessary propellant. For this purpose, such substances are suitable, which, first of all, are able to maintain a constant pressure in the canister; in addition, they must easily evaporate at room temperature, be safe and have a pleasant smell. Butane could be used, but it has an unpleasant smell and is also flammable. Among the many chemical compounds, various types of freons, liquefied fluorocarbons (from the Latin frigor — "cold"), turned out to be the most acceptable propellants. Freon-12 (CF2CI2) is often used.
Freons operate under high vapor pressure and low boiling point. So, freon-12 boils at a temperature of 29.8 C. Freons can be together with the active substance in the form of a mixture, or a separate compartment of the case is allocated for them if the freon reacts with the drug. When the sprayer is pressed under the pressure of compressed propellant gas, the liquid enters the sprayer, splits into droplets there and exits the hole in the form of an aerosol. As the can is emptied, the pressure in it decreases. This immediately leads to the "boiling" of the propellant and its transfer from the liquid until the pressure reaches the initial value again. The pressure created by the gaseous freon allows the genie to leave the canister. In this way, it is possible to maintain a constant pressure in the canister, and therefore a constant consumption of the drug, even when there is very little left. As the drug is consumed, the gas environment of the canister is constantly replenished due to the evaporation of liquid freon, which ensures an approximately constant overpressure, regardless of the content of the drug in the canister. Having done its job, i.e. transferring the contents of the canister into an aerosol, the freon quickly evaporates. In fact, only an aerosol containing no freons remains in the air. The pressure of the gas medium in the package depends on the temperature. Therefore, it is not recommended to store aerosol packages near heating devices, and some of them have an inscription — do not allow heating above 50 C. Excessive pressure at elevated temperatures can lead to increased consumption of the drug, and in some cases to a violation of the tightness of the can itself. Aerosol packages can contain a wide variety of drugs — insecticides, varnishes and paints, air fresheners, household chemicals, perfumes and cosmetics, medicines, food products (creams for decorating cakes, juices), lubricants, coolants, in short, almost any liquids and their mixtures, which makes this method universal. Watch USA online porn https://mat6tube.com teens, milfs, matures!
