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In this video you will learn what matter is, the difference between mass and weight, states of matter and changes in the states of matter. Do not forget to subscribe, like and share the video. Matter is everything that extends into a certain region of space-time, has a certain amount of energy and therefore is subject to changes in time and interactions with measuring devices. It is considered that it is what forms the sensitive part of objects perceptible or detectable by physical means. Fusion: It is the passage of a solid to the liquid state by means of heat; During this endothermic process (process that absorbs energy to carry out this change) there is a point where the temperature remains constant. The "melting point" is the temperature at which the solid melts, so its value is particular for each substance. These molecules will move in an independent way, transforming into a liquid. An example could be an ice melting, as it goes from solid to liquid. Solidification: It is the passage of a liquid to solid by means of cooling; the process is exothermic. The "freezing point" or freezing point is the temperature at which the liquid solidifies and remains constant during the change, and coincides with the melting point if it is carried out slowly (reversible); Its value is also specific. Vaporization and boiling: These are the physical processes in which a liquid passes into a gaseous state. If it is done when the temperature of the whole liquid equals the boiling point of the liquid at that pressure as it continues to heat the liquid, it absorbs the heat, but without increasing the temperature: the heat is used in the conversion of the water into a liquid state in water in a gaseous state, until the entire mass passes to the gaseous state. At that time it is possible to increase the temperature of the gas. Condensation: Condensation is called to change the state of the material that is passed from gaseous to liquid form. It is the inverse process to vaporization. If a step from gaseous to solid state occurs directly, the process is called inverse sublimation. If a step occurs from the liquid to the solid state it is called solidification. Sublimation: It is the process that consists in changing the state of the solid matter to the gaseous state without going through the liquid state. A classic example of substance capable of sublimation is dry ice. Reverse sublimation: It is the direct passage from the gaseous state to the solid state.