Precision refers to the closeness of two or more measurements to each other.
For Example: If we measure a length three times and we get 3.5 m each time. Then the measurement is very precise.
Accuracy refers to the closeness of a measured value to a standard or known value.
For Example: If the length of the substance is 4 m and one person measures 3.9 m and another person measures 3.8 m. Then, the length measured by first person is more accurate.
Thus measurement B represents both accuracy as well as precision as the darts are close and pointed at the center.
Ultrasound is sound or vibrations, having an ultrasonic frequency, particularly as used in medical imaging. Ultrasound is more commonly used in medical terminology than in industry. Infrasound is sound waves with frequencies below the lower limit of human audibility.
True, because if it wasn't a chemical reaction it would have proceeded to stay the same. but it begins to bubble. sorry if this isn't the best answer I'm trying my best.
Density of a quantity of matter is its mass divided by its volume. The mass of an object depends on the atomic mass of the individual atoms or molecules and the how close the they are compressed together.