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Mass

Just how heavy is 30 kilograms?

Everyday mass

30 kg

Scale
30 kilograms

The quantity is exact as entered.

30 kgMass in kilograms
0 kg
Human torso

The human torso is the central part of the body between the shoulders and hips, containing most major internal organs.

30.42 kgTrunk mass in a 70 kg model in kilograms
0 kg

Bar length measures mass, not physical size. Both bars start at zero kilograms (kg). Pictures identify the objects only.

A little perspective

The trunk mass in a 70 kg model of the human torso is about 1.01 times 30 kilograms.

Measurements, assumptions & sources +

30 kilograms

Mass: 30 kg; definition.

The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.

NIST — SI conversion factors

Human torso

Trunk mass in a 70 kg model: 30.42 kg; representative model; range 25 kg–36 kg.

A headless trunk in a defined 70 kg adult model: 60 cm from shoulder level to hip and 30.42 kg using a published trunk mass fraction. Arms, legs, neck and head are excluded; this is not a population average.

de Leva — Adjustments to Zatsiorsky-Seluyanov segment inertia parameters

The marked trunk mass in a 70 kg model is calibrated. Unmeasured illustration details are representative.

Measurement details

Why these numbers?

Compare 30 kilograms with the trunk mass in a 70 kg model of the human torso. The notes below explain how each value was chosen.

30 kilograms

30 kg

Mass · definition

The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.

Human torso

30.42 kg

Trunk mass in a 70 kg model · representative model · range 25 kg–36 kg

A headless trunk in a defined 70 kg adult model: 60 cm from shoulder level to hip and 30.42 kg using a published trunk mass fraction. Arms, legs, neck and head are excluded; this is not a population average.

Comparing
Mass ↔ Trunk mass in a 70 kg model
Relative size
The trunk mass in a 70 kg model of the human torso is about 1.01 times 30 kilograms. The trunk mass in a 70 kg model of the human torso is approximately 1.4% greater than 30 kilograms.

How to read the visual

The diagram uses the recorded measurements. Details outside the marked spans do not set the scale.

  • We use 30.42 kg for the trunk mass in a 70 kg model of the human torso; the recorded range is 25 kg–36 kg.
  • The trunk mass in a 70 kg model of the human torso: This is a representative comparison value; individual specimens or conditions can vary.
  • The recorded ranges overlap, so the ordering can vary even though the central values differ.

Mass is distinct from weight: an object’s mass stays the same as gravity changes.

66.139 lbpounds
0.03 ttonnes

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