AWalker's steel yard
BSpectrometer
CJoly's balance
DBeam balance
Answer:
B. Spectrometer
Read Explanation:
Understanding Relative Density and Measurement Techniques
Relative Density (Specific Gravity)
Relative density, also known as specific gravity, is the ratio of the density of a substance to the density of a reference substance, usually water.
It is a dimensionless quantity.
The formula is: Relative Density = (Density of substance) / (Density of water).
Tools for Measuring Weight and Density
Weighing Scale (Balance): A fundamental tool for measuring mass (and thus weight). Different types exist, including beam balances and spring balances.
Hydrometer: This instrument is specifically designed to measure the relative density of liquids. It works on the principle of buoyancy.
Pycnometer: A specialized flask used to determine the density of liquids and solids with high precision. It's often used in conjunction with weighing scales.
Archimedes' Principle: The principle that a body immersed in a fluid experiences an upward buoyant force equal to the weight of the fluid displaced. This principle is often applied in density measurements, especially for irregularly shaped objects, using weighing scales.
Tools NOT Typically Used for Measuring Weight via Relative Density
Spectrometer: This is an instrument used to measure the properties of light over a specific portion of the electromagnetic spectrum. It is primarily used in fields like spectroscopy, chemistry, and astronomy for analyzing the composition and properties of matter by examining how it interacts with light (e.g., absorption, emission). It does not directly measure weight or relative density.
Magnetometer: Measures magnetic field strength.
Barometer: Measures atmospheric pressure.
Thermometer: Measures temperature.