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A physicist studies energy and matter.
Chemist or Physicist
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A scientist who studies matter is called a physicist. Physicists explore the properties and behavior of matter and energy through research and experimentation.
Someone who studies matter at a very low temperature is called a cryogenicist.
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Chemistry
The branch of physical science studies the properties of matter and changes in matter is known as chemistry. This is a branch which is mainly concerned with atoms and molecules and how they interact.