Which of these is a physical phenomenon? 1.book 2.boiling liquid 3.kilometer 4.mug

the book is a physical body
boiling of a liquid – a physical process or a phenomenon
kilometer is a unit of measure for length
mug – physical body



One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.