Methods of Separation in Everyday Life – Formula & Equation Sheet
Essential formulas and equations from Curiosity, tailored for Class 6 in Science.
This one-pager compiles key formulas and equations from the Methods of Separation in Everyday Life chapter of Curiosity. Ideal for exam prep, quick reference, and solving time-bound numerical problems accurately.
Key concepts & formulas
Essential formulas, key terms, and important concepts for quick reference and revision.
Formulas
Handpicking: Separation by size, color, or shape.
Handpicking is a method used to separate small quantities of different-sized objects by hand. It is useful when particles can be easily distinguished.
Threshing: Separation of grains from stalks by beating.
Threshing is a mechanical process that removes grain from the stalks. It is commonly used by farmers to collect grains after harvesting.
Winnowing: Separation of lighter husk from heavier grains.
Winnowing uses air to separate lighter particles (husk) from heavier ones (grains). The wind blows away the lighter husk while the grains fall straight down.
Sieving: Separation based on size using sieve holes.
Sieving allows finer particles (like flour) to pass through while retaining larger particles (like bran). The effectiveness depends on hole size.
Evaporation: Separation of salt from water in a salt solution.
When seawater is placed in shallow pits and exposed to sunlight, water evaporates, leaving behind salt crystals.
Filtration: Using a filter to separate solids from liquids.
Filtration uses materials like filter paper to separate solid particles from liquids. Larger particles are trapped while clean liquid passes through.
Sedimentation: Settling of heavier particles.
Sedimentation is the process where heavier insoluble components settle down to the bottom of a liquid over time.
Decantation: Pouring off liquid after sedimentation.
Decantation involves tilting a vessel to remove the liquid above sediment while leaving the settled particles behind.
Magnetic separation: Using a magnet to separate magnetic substances.
Magnetic separation uses magnets to extract magnetic materials (like iron) from non-magnetic substances.
Churning: Separation of butter from buttermilk.
Churning involves agitating curd to separate butter (lighter) from buttermilk (heavier) by floating.
Equations
Separation efficiency = (Mass of desired product / Total mass) × 100
This equation calculates the efficiency of separation methods, representing the percentage of the desired material obtained from a mixture.
Density = Mass / Volume
Density helps determine whether a substance will sink or float in a mixture, impacting how separation methods like sedimentation work.
Rate of evaporation ∝ Surface area × Temperature
This relationship explains how increasing the surface area of a liquid or raising its temperature increases the rate of evaporation, aiding salt collection.
Filtration efficiency = (Volume of filtrate / Initial volume) × 100
It indicates the effectiveness of the filtration process in separating desired liquids from solids.
Force of wind = Mass × Acceleration
Relevant in winnowing, the wind's force influences how effectively lighter particles are separated from heavier ones.
Weight of residue = Initial mass - Weight of filtrate
This equation helps quantify what is left after a filtration process.
Time of settling = Distance / Velocity of settling
This equation calculates how long it takes for particulates to settle during the sedimentation process.
Yield of product = Mass of product obtained / Total input mass × 100
Used to evaluate the effectiveness of separation methods, showing how much useful product was derived from an input mass.
Airflow rate = Volume of air / Time
In winnowing, increased airflow rate aids in the effective separation of husk from grains.
Separation factor = (Density of component 1 - Density of component 2) / (Density of component 1 + Density of component 2)
This helps determine the feasibility of separating two substances through methods like decantation or sedimentation.
