People, all kinds of animals, and all kinds of plants exist in space, and they are entities that can be seen and touched. Anyone who has studied biology should know that these can be regarded as living beings. things". Stones, water, sun, moon, these are executive email list not living things and will occupy space. These are visible and tangible, which is what Wikipedia calls physical entities. Immaterial entities from a classical physics perspective: Then non-material entities, such as air, we can't see or touch, how to analyze these, the air contains oxygen, nitrogen, carbon executive email list dioxide and other gasification substances (under certain conditions can also become liquid, such as the carbon dioxide we use for fire fighting) . So immaterial entities, what else is there besides these vaporized substances?
There is no matter, for example, in the vacuum of outer space, nothing exists, there is nothingness. Humans are composed of various organs, organs executive email list are composed of cells, and cells are ultimately various elements. Therefore, space can be regarded as composed of various chemical elements, such as molecules, ions, inorganic substances, organic substances, plants, animals, people, various artificial objects and nothingness. The above classification executive email list will have overlapping parts, and there are different division logics according to different classification standards. (3) The space can be divided into users, media, and other elements by interactive division logic Interaction must require two elements to be called interaction.
According to the relationship of use, I will divide it into two elements: user and medium. The physical or non-physical entities that do not participate in that executive email list interaction, I call other elements. user: The user, that is, the person or animal who uses the medium. In many cases, the users we mainly consider are people, but in fact the users are not necessarily people, but may also be various animals, and different animals have different content to consider. Th executive email liste specific content related to the user will be described in a separate chapter. For now in this chapter, we only need to know that the interactive spatial element includes the user. medium: The medium is the object used by the user. Various products, computers, mobile phones, televisions, man-made objects, natural objects.