[Solved] On a phase diagram,the critical pressure is ________. A)the pressure required to melt a solid B)the pressure below which a substance is a solid at all temperatures C)the pressure above which a substance is a liquid at all temperatures D)the pressure at which a liquid changes to a gas E)the pressure required to liquefy a gas at its critical temperature Social events: Gatherings or activities designed for interaction, entertainment, or celebration among individuals or communities, often with specific purposes or themes. Invisible: Something not visible to the naked eye or not easily noticed or recognized despite being present. Ageism: Refers to prejudice or discrimination against individuals based on their age. Activism: Initiatives aimed at supporting, obstructing, guiding, or interfering in social, political, economic, or environmental change with the objective of altering societal norms.