Tag: science & technology

Neptune is the coldest planet in our solar system after Pluto's reclassification in 2006. With an average temperature of -214°C, Neptune is colder than Uranus despite being farther from the Sun. Uranus has a colder recorded minimum (-224°C) but Neptune's average temperature makes it the consistently coldest planet.

Halley's Comet was last seen in 1986, not 1987. It makes predictable appearances every 75-76 years, and its most recent perihelion (closest approach to Sun) was in February 1986. The next appearance is expected in 2061. Therefore the statement is false.

A manometer is the specific instrument designed to measure pressure, particularly gas pressure or pressure differences. Ammeters measure electric current, lactometers check milk purity, and saccharimeters measure sugar concentration. Understanding instrument purposes is key in physics measurements.

A light year is a unit of distance, not time. It measures the distance that light travels in one vacuum year, approximately 9.46 trillion kilometers. Astronomers use it to measure vast cosmic distances between stars and galaxies. It does not measure energy, speed, or intensity.

A manometer is specifically designed to measure gas pressure. A barometer measures atmospheric pressure only, while an ammeter measures electric current - neither is used for gas pressure measurement.

One gram weight is the force exerted by one gram mass under standard gravity (g=9.81 m/s²). In the CGS system, 1 dyne = 1 g·cm/s². Using F=ma and converting units: 1 gram weight = 1 gram × 981 cm/s² = 981 dynes. This is a standard conversion factor used in mechanics.