Science & Maths

The distance formula gives the straight-line distance between two points (x₁, y₁) and (x₂, y₂): d = √[(x₂ − x₁)² + (y₂ − y₁)²].…Read More →

Co-prime numbers (also called relatively prime numbers) are two numbers whose only common factor is 1, so their HCF (GCD) is 1. For example,…Read More →

The smallest odd prime number is 3. The smallest prime of all is 2, but 2 is even, so it does not count. The…Read More →

The proton was discovered by Ernest Rutherford. In experiments carried out from 1917 and published in 1919, he fired alpha particles into nitrogen gas…Read More →

Pentane has exactly three structural isomers, all with the molecular formula C5H12 and a molar mass of 72.15 g/mol: n-pentane, isopentane (2-methylbutane) and neopentane…Read More →

The specific gravity of water is 1. It is exactly 1 rather than approximately 1, because specific gravity is defined as the ratio of…Read More →

The mass of one electron is 9.109 × 10⁻³¹ kg (more precisely 9.1093837 × 10⁻³¹ kg). The same value is 9.109 × 10⁻²⁸ g,…Read More →

The molar mass of HCl (hydrogen chloride) is 36.46 g/mol. It is the atomic mass of hydrogen (1.008) plus the atomic mass of chlorine…Read More →

Type 1 superconductors expel a magnetic field completely and lose superconductivity suddenly at a single critical field Hc, which is small (a few hundredths…Read More →

N-phenylethanamide is the IUPAC name for acetanilide, an aromatic amide with the molecular formula C8H9NO and a molar mass of 135.16 g/mol. It is…Read More →

The full form of NADPH is Nicotinamide Adenine Dinucleotide Phosphate Hydrogen. It is the reduced form of NADP+, a coenzyme that carries two electrons…Read More →

The SI unit of the Hall coefficient is the cubic metre per coulomb, written m³/C or equivalently m³ A⁻¹ s⁻¹. Its dimensional formula is…Read More →