Tag: science & technology

This is FALSE. Mass is the amount of matter in an object and is constant. Weight is the force of gravity acting on mass and varies with gravitational field strength. An object's mass stays the same on Earth and Moon, but its weight changes.

This is Newton's Third Law of Motion: for every action force, there is an equal and opposite reaction force. The table exerts a downward force on the floor due to gravity, and the floor exerts an equal upward normal force on the table. These are action-reaction pairs acting on different objects.

Atoms are about 99.99% empty space - the nucleus is tiny compared to the electron cloud, and electrons themselves are point particles with virtually no volume. What we perceive as 'solidity' is actually the electromagnetic repulsion between electron clouds of adjacent atoms preventing them from occupying the same space.

A mole is defined as exactly 6.022 × 10²³ particles (Avogadro's number). This count is independent of the substance - one mole of any element contains the same number of atoms, whether it's light helium atoms or heavy lead atoms. The difference is in mass, not particle count.

A cubic meter is 100cm x 100cm x 100cm, which equals 1,000,000 cubic centimeters. The statement that there are only 100 cubic centimeters in a cubic meter is mathematically false.

Under standard atmospheric pressure (1 atm), the freezing point and melting point of water are the same: 0°C (32°F). This equilibrium temperature is where solid and liquid phases coexist. The terms 'freezing' and 'melting' describe opposite phase transitions but occur at the same temperature.

All elements can exist as gases at sufficiently high temperatures. Iron's boiling point is approximately 2862°C (5184°F). Above this temperature, iron transitions from liquid to gas phase. Phase depends on temperature and pressure - solid, liquid, and gas are just states of matter for the same substance.

Vostok Station in Antarctica recorded the lowest temperature ever measured on Earth: -89.2°C (-128.6°F) on July 21, 1983. Oymyakon is the coldest inhabited place on Earth, but not the location of the absolute record low.

The 1958 Lituya Bay megatsunami in Alaska reached an estimated height of 1,720 feet (524 meters), making it the tallest wave ever recorded. It was caused by a landslide, not a typical ocean wave or surf break like Jaws or Isla Todos Santos.