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什麼是壓力？
物理學上的壓力，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。 （物體間由於相互擠壓而垂直作用在物體表面上的力，叫作壓力。）例如足球對地面的力，物體對斜面的力，手對牆壁的力等。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。
壓力定義是什麼呢？
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。
什麼是壓力？
從心理學角度看，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。通俗地講，壓力就是一個人覺得自己無法應對環境要求時產生的負性感受和消極信念。物理定義具有客觀屬性，是指垂直作用於流體或固體界面單位面積上的力；
心理壓力即精神壓力，現代生活中每個人都有所體驗，心理壓力總的來說有社會、生活和競爭三個壓力源。壓力過大、過多會損害身體健康。
壓力可以激活一種能夠影響代謝和有助於攝取甜食及油膩食品的基因。科學家發現了一種讓我們對甜食和油膩食品食慾大開，而且在壓力情境中變胖的基因。
壓力來源
1、造成壓力的工作因素
對工作的不滿意以及工作量多與工作要求高常是造成工作壓力的主要因素，尤其當得到的報酬與個人的付出不成比例時，個人更容易覺得不公平，壓力感也相對增加。
2、造成壓力的生活因素
生活環境中偶爾會發生一些重大的事故（變動），例如配偶死亡、離婚、換工作、結婚、懷孕等都是構成壓力的因素。
3、造成壓力的個人性格
外在的環境及事件確實會給個體帶來壓力，但相同事件發生在不同人身上，卻未必會構成同樣的威脅。因此，個人性格決定了個人如何看待壓力事件，以及個人如何應對和調節壓力。

What is stress?
Pressure in physics 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. (The force that acts vertically on the surface of an object due to mutual extrusion is called pressure.) For example, the force of a football on the ground, the force of an object on an inclined plane, and the force of a hand on a wall, etc. Traditionally, in mechanics and most engineering disciplines, the word "pressure" is synonymous with pressure in physics.
What is the definition of stress?
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.
What is stress?
From a psychological point of view, stress is a cognitive and behavioral experience process composed of psychological stressors and psychological stress responses. In layman's terms, stress is the negative feelings and negative beliefs that arise when a person feels that he is unable to cope with the demands of the environment. The physical definition has objective properties and refers to the force acting vertically on the unit area of ​​the fluid or solid interface;
Psychological stress is mental stress, which is experienced by everyone in modern life. Generally speaking, psychological stress has three stress sources: society, life and competition. Too much stress can damage your health.
Stress can activate a gene that affects metabolism and facilitates the intake of sweet and greasy foods. Scientists have discovered a gene that increases our appetite for sweet and greasy foods and makes us fatter in stressful situations.
source of stress
1. Work factors that cause stress
Dissatisfaction with the job, heavy workload and high job requirements are often the main factors that cause work stress, especially when the remuneration is not proportional to the individual's contribution, the individual is more likely to feel unfair and the pressure is relatively increased.
2. Life factors that cause stress
Occasionally, major accidents (changes) in the living environment, such as death of a spouse, divorce, job change, marriage, pregnancy, etc., are all stressful factors.
3. Personal traits that cause stress
External circumstances and events do cause stress to individuals, but the same events that happen to different people may not necessarily pose the same threat. Thus, personal character determines how an individual perceives stressful events and how an individual responds to and regulates stress.