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壓力是指發生在兩個物體的接觸表面的作用力，或者是氣體對於固體和液體表面的垂直作用力，或者是液體對於固體表面的垂直作用力。壓力是由於相互接觸的兩個物體互相擠壓發生形變而產生的，按照力的性質劃分，壓力屬於彈力。壓力的國際單位：“牛頓”，簡稱“牛”，符號“N”。在力學和多數工程學科中，有時“壓力”一詞與物理學中的壓強同義。
壓力的特點：
1.作用方向與作用面積垂直，並與作用面積的外法線方向相反。
2.壓力一定時，受力面積越小，壓力作用效果越顯著。
3.受力面積一定時，壓力越大，壓力作用效果越顯著。
壓力的概念
1、物理壓力：指發生在兩個物體的接觸表面的作用力，或者是氣體對於固體和液體表面的垂直作用力，或者是液體對於固體表面的垂直作用力。習慣上，在力學和多數工程學科中，“壓力”一詞與物理學中的壓強同義。
產生機理：
固體表面的壓力通常是彈性形變的結果，一般屬於接觸力。液體和氣體表面的壓力通常是重力和分子運動的結果。
壓力的作用方向通常垂直於物體的接觸面。如果觀測到壓力的作用方向與接觸面並不垂直，通常是由於壓力和摩擦力共同作用的結果。
2、心理壓力：壓力是心理壓力源和心理壓力反應共同構成的一種認知和行為體驗過程。壓力（stress）是一個外來詞，來源於拉丁文“stringere”，原意是痛苦。
現在所寫的單詞是“distress（悲痛、窮困）”的縮寫。有“緊張、壓力、強調”等意思，壓力會影響人們的身心健康，早已被公認。心理學家漢斯·塞爾斯（HanSelye）是第一個使用術語“stress（壓力）”的人。

Pressure refers to the force that occurs on the contact surfaces of two objects, either the vertical force of a gas on the surface of a solid and a liquid, or the vertical force of a liquid on a solid surface. Pressure is produced by the extrusion and deformation of two objects in contact with each other. According to the nature of force, pressure belongs to elastic force. The international unit of pressure: "Newton", referred to as "Newton", symbol "N". In mechanics and most engineering disciplines, the word "pressure" is sometimes synonymous with pressure in physics.
Features of Stress:
1. The action direction is perpendicular to the action area and opposite to the outer normal direction of the action area.
2. When the pressure is constant, the smaller the force area is, the more significant the pressure effect is.
3. When the force area is constant, the greater the pressure, the more significant the pressure effect.
stress concept
1. Physical pressure: refers to the force that occurs on the contact surfaces of two objects, or the vertical force of a gas on the surface of a solid and a liquid, or the vertical force of a liquid on the surface of a solid. Traditionally, in mechanics and most engineering disciplines, the word "pressure" is synonymous with pressure in physics.
Generation mechanism:
The pressure on a solid surface is usually the result of elastic deformation and is generally a contact force. The pressure on the surfaces of liquids and gases is usually the result of gravity and molecular motion.
The direction of action of the pressure is usually perpendicular to the contact surface of the object. If pressure is observed to act in a direction that is not perpendicular to the contact surface, it is usually due to the combined effect of pressure and friction.
2. Psychological stress: Stress is a cognitive and behavioral experience process composed of psychological stressors and psychological stress responses. Stress is a foreign word derived from the Latin "stringere", which means pain.
The word now written is an acronym for "distress". It has the meanings of "tension, stress, stress", etc. It has long been recognized that stress can affect people's physical and mental health. Psychologist Han Selye was the first to use the term "stress".