There is no air or heat in the can.
The canning process requires the cans to be pressure heated. This sterilises the contents.
Because of the heat used to can the food.
The principle objective of canning is to kill microorganisms that may be harmful to people or to food quality.
Water doesn't necessarily preserve food. However, the canning process can preserve food. The boiling process can prevent any transfer of bacteria, fungus or microbes.
prior to the canning all bacteria in the food are killed and the canning prevents new bacteria from infecting and spoiling the canned food Food that is put into canning jars is not sterile, thereby allowing bacteria to grow. Canning sterilizes the food and the jar, killing any thing in the jar. Water boils at 212 which is the temperature for sterilization. If using a presure canner, the combination of the pressure and the boiling sterilize meats, veggies, etc.
irradiation
Irradiation preserves food by destroying microbes just as heat does in the canning process. In both processes, the food must have been first sealed in a container e.g., a can, jar, or pouch.
Aseptic just means hygienic and free of microbes. So naturally, aseptic canning means canning in a manner which is safe and aims to prevent the growth of things that can make you sick.
Microbes can be prevented from spreading through measures such as regular handwashing, disinfection of surfaces, and proper food handling practices. For example, handwashing with soap and water helps to remove microbes from the hands, while disinfecting surfaces kills microbes present on them. Proper food handling practices, such as cooking food to the appropriate temperature, help to kill microbes that may be present in the food.
sometimes Bactria can kill microbes
What parts A-G try to kill microbes?
To safely preserve food using canning without a water bath, you can use the pressure canning method. This involves sealing the food in jars and processing them at high temperatures to kill bacteria and prevent spoilage. It is important to follow proper guidelines and instructions to ensure the safety of the canned food.