Explanation:
1. Standard metric unit of length → meter
Unit is defined as the quantity that is used as a standard for measurement. Meter, Centimeters, hectometers are the units which is used to express length of a substance.
2. A proposed explanation for a scientific problem → hypothesis
Hypothesis is defined as explanation or supposition made on the basis of limited evidence for a specific process or phenomena.
3. Standard unit of volume → liter
Liter is the unit which is used to express volume occupied by the substance.
4. The curved top surface of a liquid column → meniscus
Liquids from two types of meniscus :
Concave shaped curve due to adhesive forces and is dominating inside the glass.
Convex shaped curve due to due to cohesive forces and is dominating on the top of glass.
5. A quantity in an experiment that remains unchanged or constant → control
Control variable is an experimental variable which is kept unchanged or remains constant through out the course of an experiment.
6. Amount of matter in an object → mass
Mass of the body is defined as quantity of present in a given object. It is a constant quantity.
