How can we estimate the molecular diameter of chemical species, explain briefly.
Answers
Explanation:
Divide both sides by p (rho). (vp= m is equal to v = m / p). The resulting value for v is the volume or three-dimensional size of the molecule.
Hope it well help you
Explanation:
molecular diameter of CO2 is larger than that of O2, with a value of 3.34 × 10−8 cm. Thus, based on the pore size, film can be selectively permeable to gases. The carbon dioxide barrier can be quantified by the CO2 permeability coefficient (CO2PC) with a unit of kg m/(m2 s Pa). The carbon dioxide transmission rate is usually denoted in g/m2 day and is correlated to the CO2PC as described previously for the oxygen parameter. During the packaging and storage of fresh fruits and vegetables, O2 reduces and CO2 increases owing to the natural respiration of the packed products. This phenomenon slows respiration and thus the ripening and senescence of packed produce occurs [52]. A high CO2 concentration further creates an anaerobic environment that leads to the fermentation of food. Thus, packaging films have to be semipermeable to gases to maintain the shelf life of a product by creating a modified atmosphere