Final answer:
Spacing for encounters with friends and close acquaintances is determined by proxemics, which regulates interpersonal space. Personal space varies based on cultural background and comfort zones.
Step-by-step explanation:
According to Edward T. Hall, spacing for encounters with friends and close acquaintances is determined by proxemics, which refers to interpersonal space that regulates intimacy. Proxemics can vary based on cultural background and individual comfort zones. In Western cultures like the United States, personal space is typically maintained at an arm's length during face-to-face conversations. However, different cultures may have different norms for personal space.