Units related to mass:
→ 1 quintal = 100 kg
→ 1 metric ton (also called a tonne) = 1,000 kg
→ 1 Atomic Mass Unit (amu) or Dalton = 1.66 × 10-27 kg
→ Unified atomic mass unit is denoted by u.
→ 1 slug = 14.59 kg
→ 1 kg = 2.205 pounds (lbs)
→ 1 pound (lb) = 0.4536 kg
→ 1 pound (lb) = 16 ounces
→ The largest unit used to express mass is Chandra Shekhar Limit.
→ 1 Chandrasekhar limit = 1.4 times the mass of the sun = 2.765 × 1030 kg
→ Mass of the sun = 1.989 × 1030 kg
→ The purity of gold is measured in karat.
→ 24 karat is considered the purest form of gold.
→ 22-karat gold is commonly used for making jewelry. 22-karat gold is made up of approximately 91.67% pure gold and 8.33% other metals like copper, silver etc.
→ The percentage of pure gold in 18-karat gold is 75%.
→ Diamonds are measured(by weight) in carats.
→ One carat = 0.2 grams = 200 milligrams.
→ Carat is a unit of mass.
→ 1 bale of cotton = 170 kg (in India)
→ 1 ounce = 28.35 grams
Units related to time:
→ 1 solar day = 24 hours = 86,400 seconds.
→ Sidereal day: This is the precise time for Earth to complete one full rotation on its own axis relative to the distant stars and this is equal to 23 hours, 56 minutes and 4.09 seconds.
→ The spin or rotation of the Earth on its own axis causes the cycle of day and night. As the Earth rotates from west to east, the side of earth facing the sun experiences daytime, while the opposite side of earth is in darkness, experiences night. One full rotation of the Earth on its own axis takes about 24 hours.
→ The movement of the Earth around the Sun in a fixed path or orbit is called a revolution.
→ One complete revolution for the Earth around the Sun takes approximately 365.25 days, which is equal to 1 year. The extra quarter of a day(0.25 day) is added to the calendar every four years creating a leap year(366 days).
→ 1 Leap year = 366 days
→ In leap year, the month of February has 29 days.
→ The Moon takes approximately 27.3 days to revolve around the Earth.
→ 1 Time Measurement Unit (TMU) = 0.036 seconds.
→ The smallest unit of time is shake.
→ 1 shake = 10-8 seconds.
→ A cosmic year is the time it takes for our solar system to complete one full revolution around the center of the Milky Way galaxy.
→ 1 cosmic year (galactic year) = 225 to 250 million years (approximately).
Some important points:
→ Cusec stands for cubic foot per second.
→ "Cusec" means one cubic foot of water flow per second.
→ 1 cusec is approximately equal to 7.48 gallons per second.
→ 1 cusec = 28.317 litre/second.
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