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MY PURE SUBJECTS PHYSICS AND CHEMISTRY, HENCE I CAN ANSWER THE PHYSICS & CHEMISTRY QUESTIONS.........
▶️The volume of mercury changes slightly with temperature; the small change in volume drives the narrow mercury column a relatively long way up the tube. The mercury will be able to expand and contract as per heat gain or heat loss (increasing or decreasing temperature).
▶️ Speed or Velocity is the term which we use to refer how fast an object is moving. But, the term (unit) which we used to measure the speed of an object is usually metre per second but can also be kilometre per hour.
▶️Please refer to your textbook once for the required units you want to know.
▶️Elements and compounds
▶️ Acids tastes sour whereas bases are bitter in taste.
▶️ Mixture, Mixture, Pure
▶️ Alkalies are special bases which dissolves in water, i.e., those bases which are soluble in water are only called alkalies and that is why all alkalies are bases but all bases are not alkalies. example - KOH