![]() ![]() This is a physical and reversible change.Ĭhange of vapour into water (Condensation) : This is also a physical and reversible change as water can be changed into vapour again by the process of vaporization. Water can be obtained after condensation of vapour. Water can be obtained back from ice by melting.Ĭhange of water into vapour (Vaporisation) : Vapour is another state of water. In this change there is only the change in the state of water. This is an example of physical and reversible change.įreezing of water:After freezing, water changes into ice. Water can be changed to ice and vice-versa. ![]() Melting of ice into water: In melting, only the state of water changes. ![]() This is an example of physical and reversible change. Solid wax can be obtained from molten wax. This i: In melting, only the state of the wax changes from solid to liquid. Melting of wax: In melting, only the state of the wax changes from solid to liquid. Since no new substance is formed in this process, so it is a physical change. Tearing of paper sheet: Even after being torn in very small pieces each piece is a piece of paper. Moreover, no new substance is formed in this process, so it is a physical change. Most of the physical changes are reversible, this means we can get the substance back even after the change.įolding of a paper sheet : A paper can be folded or unfolded and hence it is an example of physical change. For example, when milk turns into curd it cannot be changed back to milk and hence is an irreversible change.Ĭhange in which only physical properties of a substance change and no new substance is formed is called Physical Change. Irreversible: Things or processes which cannot be reversed are called irreversible. For example, a folded sheet of paper can be unfolded and hence folding a sheet of paper is reversible. Reversible : Things or processes which can be reversed are called reversible. For example curd is the product of milk but the internal properties of milk and curd are completely different. For example when a sheet of paper is folded, its shape changes and this is an example of change in physical property.Ĭhemical Properties : The internal properties of a substance are known as chemical properties. Physical Properties : Shape, Size and State of substance are known as physical properties. Fig: Physical and chemical change respectively physical properties, chemical properties, reversible and irreversible. are the examples of changes around us.īefore knowing the scientific meaning of changes, it is necessary to understand some terms, i.e. Growth of tree, rising of sun, setting of sun, different shape and size of moon, burning of coal, paper, wood, etc. We see different types of changes everyday in our surroundings. ![]()
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