Density (ρ) is mass per unit volume, typically in kg/m³ or g/cm³. It describes how tightly matter is packed. Steel ≈ 7850 kg/m³, aluminum ≈ 2700 kg/m³, water = 1000 kg/m³.

Kako se masa računa iz gustoće i volumena?

Mass = Density × Volume (m = ρ × V). For example: a 0.5 m³ block of steel (7850 kg/m³) weighs 7850 × 0.5 = 3925 kg.

Kako se volumen računa iz dimenzija?

Cube: V=a³. Cylinder: V=π×r²×h. Sphere: V=4/3×π×r³. Hollow cylinder: V=π×(R²-r²)×h. Cone: V=1/3×π×r²×h.

Buoyancy force equals the weight of displaced fluid: F_b = ρ_fluid × V × g. An object floats if its density is less than the fluid density. Steel sinks in water (7850 > 1000 kg/m³).

Što je specifična težina?

Specific gravity (SG) is the ratio of a material's density to water density (1000 kg/m³). It is dimensionless. Steel SG ≈ 7.85, aluminum SG ≈ 2.70, titanium SG ≈ 4.51.

Besplatan Inženjerski Alat

Kalkulator gustoće / mase / zapremine

Riješite za gustoću, masu ili volumen. 30+ unaprijed postavljenih materijala, kalkulator volumena prema obliku, provjera uzgona i višenitni izlaz.

ρ = m / V 30+ Materials Shape Volume Buoyancy

Solve For

Unaprijed postavljeni materijal

Density ρ (kg/m³)

Zapremina od oblika

Mass (kg)

Volume (m³)

Dužina / Stranica a (mm)

Width b (mm)

Visina / Dužina h (mm)

Outer Radius R (mm)

Inner Radius r (mm, samo šupalja)

Quick presets

Results

Density ρ

—

Mass m

—

Volume V

—

Težina (više jedinica)

—

Specifična težina

—

Uzgon u vodi

—

Osnovne formule

Formule za zapreminu oblika

Buoyancy

An object floats if ρ_object < ρ_fluid. The net submerged weight = m×g − ρ_fluid×V×g.

Praktični primjer

Primer — Čelična šupalja cilindar (cev)

Given: OD=100mm, ID=80mm, Length=500mm, ρ=7850 kg/m³

V = π×(50²−40²)×500 = π×(2500−1600)×500 = 1,413,717 mm³ = 0.001414 m³

m = 7850 × 0.001414 = 11.1 kg = 24.4 lb

Weight in water: F_b = 1000 × 0.001414 × 9.81 = 13.87 N → submerged weight = 95.0 N

Baza podataka gustine materijala

Material	kg/m³	g/cm³	lb/ft³
Carbon Steel	7,850	7.85	490
Stainless 304	7,930	7.93	495
Stainless 316	8,000	8.00	499
Liveno gvožđe (Sivo)	7,200	7.20	449
Aluminum 6061	2,700	2.70	169
Aluminum 7075	2,810	2.81	175
Copper	8,900	8.90	556
Brass	8,500	8.50	531
Bronze	8,800	8.80	549
Titanium	4,510	4.51	282
Magnesium	1,740	1.74	109
Lead	11,340	11.34	708
Nickel	8,908	8.91	556
Gold	19,300	19.30	1,205
HDPE	920	0.92	57
PVC	1,400	1.40	87
PTFE (Teflon)	2,200	2.20	137
Concrete	2,500	2.50	156
Glass	2,200	2.20	137
Oak Wood	600	0.60	37
Water (20°C)	1,000	1.00	62.4
Seawater	1,025	1.025	64.0
Diesel Fuel	870	0.87	54.3

Kalkulator gustoće, mase i volumena | ρ=m/V | Kalkulator oblika | Besplatan alat

Published by Nikolai Shelkovenko on Februar 15, 2026 Februar 15, 2026

Results

Osnovne formule

Formule za zapreminu oblika

Buoyancy

Praktični primjer

Baza podataka gustine materijala

Prodavnica

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