Immersed Weight Calculator
Calculate object weight when submerged in liquids using Archimedes' principle
Object Properties
Weight of the object in air
Total volume of the object
Example: Rock in Water
Given Values
Rock weight: 500 grams
Rock volume: 200 ml
Water density: 1000 kg/m³
Calculation
Buoyant Force = ρ_water × V_object × g
Buoyant Force = 1000 × 0.0002 × 9.8 = 1.96 N
Immersed Weight = 4.9 N - 1.96 N = 2.94 N
Result: 300 grams (will sink)
Key Physics Principles
Archimedes' Principle
Buoyant force equals weight of displaced fluid
Buoyant Force
F_b = ρ_liquid × V_object × g
Immersed Weight
W_immersed = W_object - F_buoyant
Common Liquid Densities
Physics Tips
Negative immersed weight means the object will float
Higher liquid density creates more buoyant force
Object density determines sink or float behavior
Volume affects total buoyant force magnitude
Understanding Immersed Weight and Buoyancy
What is Immersed Weight?
Immersed weight is the apparent weight of an object when it's submerged in a liquid. Due to buoyancy, objects feel lighter underwater than they do in air. This phenomenon explains why we feel weightless when swimming.
Archimedes' Principle
- •Any object immersed in fluid experiences upward buoyant force
- •Buoyant force equals weight of displaced fluid
- •Explains why ships float and rocks sink
Key Formulas
Buoyant Force:
F_b = ρ_liquid × V_object × g
Immersed Weight:
W_immersed = W_object - F_buoyant
Object Density:
ρ_object = m_object / V_object
Variables
- ρ: Density (kg/m³)
- V: Volume (m³)
- g: Gravitational acceleration (9.8 m/s²)
- F_b: Buoyant force (N)
- W: Weight (N)
Float or Sink?
Will Sink
- • ρ_object > ρ_liquid
- • Positive immersed weight
- • Buoyant force < Object weight
- • Example: Rock in water
Neutrally Buoyant
- • ρ_object = ρ_liquid
- • Zero immersed weight
- • Buoyant force = Object weight
- • Example: Submarine submerged
Will Float
- • ρ_object < ρ_liquid
- • Negative immersed weight
- • Buoyant force > Object weight
- • Example: Wood in water
Real-World Applications
Engineering Applications
- • Ship design and naval architecture
- • Submarine ballast systems
- • Hot air balloon calculations
- • Offshore platform stability
- • Hydrometers for density measurement
Scientific Applications
- • Material density determination
- • Geological surveys underwater
- • Marine biology research
- • Quality control in manufacturing
- • Archaeological underwater excavation