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A balloon inflated with helium is able to float toward the ceiling because
Chronological Age
The amount of time that has elapsed since an individual's birth, typically measured in years, months, and days.
Mental Age
A measure of an individual's mental aptitude based on the average abilities of a certain age group.
Chronological Age
The actual age of a person or object, measured in years from the date of birth or creation.
Alfred Binet
A French psychologist who, with his colleague Théodore Simon, developed the first practical intelligence test in the early 20th century.
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