Massaa jenis Satuan Kesalahan (g/cm³ vs kg/m³)
ρ = m/V is simple — until satuan disagree. These traps cost marks dalam massaa jenis and buoyancy questions.
ρ = m / V — 1 g/cm³ = 1000 kg/m³ · 1 L = 0.001 m³
Jebakan 1: Mixing grams with cubic metres
Salah: m = 250 g, V = 0.00025 m³ → ρ = 250 / 0.00025 without converting massa.
Benar: Ubah m = 0.250 kg first → ρ = 0.250 / 0.00025 = 1000 kg/m³.
Perbaikan: Pair g with cm³ (→ g/cm³) or kg with m³ (→ kg/m³).
Jebakan 2: Treating liters as cubic metres
Salah: V = 2 L into ρ = m/V with m dalam kg as if V were 2 m³.
Benar: 2 L = 0.002 m³. Off-by-1000 errors are almost always liters vs m³.
Perbaikan: 1 L = 0.001 m³ = 1000 cm³.
Jebakan 3: Forgetting 1 g/cm³ = 1000 kg/m³
Salah: Aluminum 2.7 g/cm³ reported as 2.7 kg/m³ dalam an SI buoyancy rumus.
Benar: 2.7 g/cm³ = 2700 kg/m³.
Perbaikan: Water is about 1 g/cm³ or 1000 kg/m³ — use that as a sanity periksa.
Jebakan 4: Putting benda massaa jenis into Fb = ρVg
Salah: Using steel massaa jenis for ρ when finding buoyant gaya di dalam air.
Benar: ρ dalam Fb = ρVg is the fluid massaa jenis. Object massaa jenis is for float/sink comparison.
Perbaikan: Fresh water ≈ 1000 kg/m³ unless the problem gives salt water or another fluid.
Jebakan 5: Comparing massaa jenis to berat
Salah: “Massaa jenis 800 kg/m³ is less than berat 20 N so it floats.”
Benar: Bandingkan densities (benda vs fluid) or gayas (W vs Fb) — never massaa jenis to newtons.
Perbaikan: Same kind of quantity on both sides of a comparison.
Kesimpulan
Match massa and volume satuan sebelum membagi, convert g/cm³ ↔ kg/m³ with ×1000, and put fluid massaa jenis — not benda massaa jenis — into Fb = ρVg.
FAQ
Berapakah the massaa jenis rumus?
ρ = m / V. Susun ulang to m = ρV or V = m/ρ with matching satuan.
Bagaimana cara saya convert g/cm³ to kg/m³?
Kalikan by 1000. Contoh: 2.7 g/cm³ → 2700 kg/m³.
Latihan ρ = m/V · Massaa jenis Kalkulator · Gaya apung Kalkulator · Berat Kalkulator · Satuan Ubaher
ρ = m/V Rumus Latihan · Cara menghitung Massaa jenis · Cara menghitung Buoyant Gaya