The population size (PS) sensitivity on the spread rate of COVID-19 is assessed. • Likewise, the ambient temperature (AT) sensibility is estimated. • The transmission rate of the COVID-19 has a low sensibility to the variations of AT. • The transmission rate of the COVID-19 has a high sensitivity to the variations of PS. • The PS of over 1.7 million can enhance the transmission rate of the COVID-19 disease.

In recent years, quality assessment of agricultural materials and food products by acoustic analysis has been one of the major research areas in the field of post-and preharvest technology. Acoustic properties of food can be used to indicate numerically important quality attributes such as crunchiness, crispness, firmness, water activity and so on. Physical characteristics and other quality parameters that attribute to the internal quality of agriculture and manufactured foods can be measured by this nondestructive method. The present study introduces briefly the acoustic properties of agro-food products as well as outlines the importance and application of this technology in food and agricultural industries, where still further research is required to fully comprehend this technology. PRACTICAL APPLICATIONSThe review summarizes knowledge about application of acoustic for quality assessment of agro-food products. If the knowledge and the presented techniques are combined and applied in an innovative and carefully planned way, commercial applications of these techniques will be beneficial for the consumer as well as the growers and traders. The risk of buying poor-quality products will significantly decrease, the income of fruit growers corresponding to the quality of their products will increase and merchants will be able to comply with consumer demands for uniform high-quality products.

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