계산 방법 밀도 (ρ = m/V): 질량 ÷ Volume
계산 밀도 with ρ = m/V. 단위 함정 (g/cm³ vs kg/m³), float vs sink, 일ed examples, and a free 밀도 calculator.
What 밀도 Asks
밀도 tells you how much 질량 is packed into a given volume. A kilogram of steel takes less space than a kilogram of foam — steel has higher 밀도.
The 공식 is ρ = m / V (rho = 질량 over volume). With 질량 in kilograms and volume in cubic metres, 밀도 is in kg/m³. Water is about 1000 kg/m³; many woods are less, most metals are more.
If you already have m and V (or ρ and one unknown), open the free 밀도 calculator first, then return here for unit traps and the link to buoyancy.
The 공식s
Keep 단위 consistent. If 질량 is in grams and volume in cm³, 밀도 comes out in g/cm³. 1 g/cm³ = 1000 kg/m³ (same as water).
밀도 and Floating
Buoyant 힘 uses fluid 밀도: Fb = ρ V g. See buoyant 힘 and the
An object denser than the fluid tends to sink when fully submerged; less dense materials float. 비교 object 밀도 to fluid 밀도, or 비교 무게 to maximum Fb.
Object 무게 is W = mg — use the 무게 calculator when you need newtons from kilograms.
단위
풀이 예제
예제 1: 12 kg in 0.003 m³
ρ = m/V = 12 / 0.003 = 4000 kg/m³.
예제 2: find 질량
ρ = 7800 kg/m³ (steel-like), V = 0.002 m³. m = ρV = (7800)(0.002) = 15.6 kg.
예제 3: find volume
m = 2.0 kg, ρ = 1000 kg/m³ (water). V = m/ρ = 2.0/1000 = 0.002 m³ = 2.0 L.
예제 4: g/cm³ to kg/m³
ρ = 2.7 g/cm³ (aluminum). In SI: 2.7 × 1000 = 2700 kg/m³.
흔한 실수
확인 It on the 계산기
밀도 calculator — ρ = m/V.
학습 ρ = m/V and confirm every home일 number on the calculator.