Physics Measuring Instruments

A manometer measures pressure, particularly gas and liquid pressure, using a column of liquid. Saccharimeter measures sugar concentration, ammeter measures electric current, and lactometer measures milk density. The prefix 'mano-' refers to pressure in scientific instruments.

This is a duplicate of question 82539 with formatting differences in the options (a./b./c./d. prefixes). A manometer is the correct instrument for measuring pressure. The answer is identical to the previous question.

A seismograph detects and records seismic waves produced by earthquakes. Barometers measure air pressure, hydrometers measure liquid density, and polygraphs are used for lie detection.

Paper is measured in reams (typically 500 sheets) and caliper (thickness measurement). This standard industry practice allows for consistent paper quantity and thickness specifications in printing and manufacturing.

A seismograph measures earthquake intensity and records seismic waves. Barometer measures air pressure, hydrometer measures liquid density, and polygraph detects lies.

A manometer is the instrument used to measure pressure, particularly gas pressure. Saccharimeter measures sugar concentration, ammeter measures electric current, and lactometer measures milk density.

A manometer is specifically designed to measure the pressure of gases, typically using a column of liquid. A barometer measures atmospheric pressure specifically, while an ammeter measures electric current.

A seismograph is the instrument used to detect and record the intensity of earthquakes by measuring ground movement. Barometers measure atmospheric pressure, hydrometers measure liquid density, and polygraphs are lie detectors.

To answer this question, the user needs to know what humidity is and how it is measured. Humidity refers to the amount of moisture or water vapor in the air. It is measured using an instrument called a hygrometer.

Option A, Barometer, is not the correct answer because a barometer is used to measure atmospheric pressure, not humidity.

Option B, Thermometer, is not the correct answer because a thermometer is used to measure temperature, not humidity.

Option C, Hygrometer, is the correct answer because a hygrometer is specifically designed to measure humidity. It works by measuring the amount of moisture in the air and expressing it as a percentage of the maximum amount of moisture that the air can hold at a given temperature.

Option D, Hydrometer, is not the correct answer because a hydrometer is used to measure the density of a liquid or the specific gravity of a substance, not humidity.

Therefore, the answer is: C. Hygrometer.

The GRID Compass 1100, introduced in 1982, is widely considered the world's first true laptop computer. It featured the classic clamshell design, folding screen, and portability that defined laptop form factors for decades. It was used by NASA and military, though cost around $8,000. The other options are measuring instruments, not computers.

Reactance is the opposition to AC current flow and is measured in ohms, just like resistance. While capacitors are measured in farads and conductance in siemens, reactance itself is always expressed in ohms.

A manometer is the instrument specifically designed to measure pressure, particularly gas or liquid pressure. A saccharimeter measures sugar concentration, an ammeter measures electric current, and a lactometer measures the density of milk to determine purity.

A seismograph is the instrument used to measure the intensity of earthquakes. It records the seismic waves produced by earthquakes. Barometer measures atmospheric pressure, hydrometer measures specific gravity, and polygraph is a lie detector.