Select the word which means the same as the group of words given. An instrument used for measuring atmospheric pressure
barometer
Understanding Instruments for Measurement
The question asks us to identify the specific instrument used for measuring atmospheric pressure. Let's break down the term and then look at the options provided.
What is Atmospheric Pressure?
Atmospheric pressure is the pressure exerted by the weight of the air in the Earth's atmosphere. It changes with altitude and weather conditions. Measuring atmospheric pressure is important in meteorology (the study of weather) and for aviation.
Analyzing the Options for Measuring Instruments
We are given four options, each representing a different measuring instrument. Let's examine what each instrument measures:
- Altimeter: An altimeter is an instrument used to measure altitude, which is the height above a fixed level, especially sea level. While altitude and atmospheric pressure are related (pressure decreases as altitude increases), an altimeter measures altitude, not pressure directly, though some work by sensing pressure changes.
- Thermometer: A thermometer is an instrument used to measure temperature. Temperature is a measure of the degree or intensity of heat present in a substance or object.
- Barometer: A barometer is a scientific instrument used to measure atmospheric pressure. It is widely used in meteorology as changes in atmospheric pressure can indicate changes in weather patterns.
- Voltmeter: A voltmeter is an instrument used for measuring electric potential difference between two points in an electric circuit. This difference is commonly known as voltage.
Identifying the Correct Instrument
Based on the functions of the instruments listed, the one specifically designed for measuring atmospheric pressure is the barometer.
Summary of Instruments and Their Uses
| Instrument | What it Measures |
|---|---|
| Altimeter | Altitude |
| Thermometer | Temperature |
| Barometer | Atmospheric Pressure |
| Voltmeter | Electric Potential Difference (Voltage) |
Therefore, the word that means the same as "an instrument used for measuring atmospheric pressure" is barometer.
Revision Table: Measurement Instruments
| Instrument | Primary Measurement | Related Field |
|---|---|---|
| Barometer | Atmospheric Pressure | Meteorology, Aviation |
| Thermometer | Temperature | Meteorology, Physics, Health |
| Altimeter | Altitude (often via pressure) | Aviation, Mountaineering |
| Voltmeter | Voltage | Electronics, Physics |
Additional Information: Types of Barometers and Units
Barometers come in different types, the most common being the mercury barometer and the aneroid barometer.
- Mercury Barometer: Invented by Evangelista Torricelli, it uses a column of mercury in a glass tube to balance the weight of the atmosphere.
- Aneroid Barometer: This type uses a small, flexible metal box called an aneroid cell, which expands or contracts with changes in atmospheric pressure.
Atmospheric pressure can be measured in several units, including:
- Pascals (Pa) or kilopascals (kPa) - the SI unit.
- Millibars (mb) or hectopascals (hPa) - commonly used in meteorology.
- Inches of mercury (inHg) or millimeters of mercury (mmHg) - often used in weather reports.
- Atmospheres (atm) - a standard reference pressure.
Standard atmospheric pressure at sea level is approximately 101.3 kPa, 1013.25 hPa or mb, 29.92 inHg, or 760 mmHg.
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