A mixture of salt and sand is an example of a physical change since the process is reversible.
bulb
scratch paper
Scratching it
physical examples are examples of thing or changes or transformations which you can see with you eyes or hold with your hands.
This can be a thermometer which changes couler when hot or cold
Examples: melting, boiling, mechanical processing.
Synthesis, decomposition, combustion, and oxidation are some examples of chemical changes (reactions) of matter.
Not all physical changes are reversible because most times when such changes occur parts of the substance is lost to the environment.
melting candle wax it changes from a non clear to a clear form of matter
Puberty
Of course they do. Some examples are fizzing, when a gas is produced, colour changes, and the formation of precipitates.
Some examples of threats that can be identified through a SWOT analysis include competition from other businesses, changes in market trends, economic downturns, and regulatory changes that may impact the business negatively.