Physical Weight Box Iron 100gm

Quick Answer: The Physical Weight Box Iron 100gm is a boxed set of iron masses that together make up 100 g, used with a physical (beam) balance to find the mass of objects by comparison. Individual pieces are combined to match the load in the other pan.

Weighing by Comparison on a Physical Balance

A physical balance compares two masses directly: the object goes in the left pan, known masses go in the right, and the beam is level when the two are equal. The weight box iron 100gm supplies those known masses. School weight sets are usually built on a 1-2-2-5 sequence in each decade, so a small number of pieces can be combined to make every whole-gram value up to the total, and students learn to work down from the largest piece that does not overshoot.

Iron is the practical choice for a class set. Compared with brass weights, iron masses make it more economical to equip many benches, but they are more prone to rust and to small changes in mass if handled with damp fingers, which is why they suit routine school weighing rather than calibration work. Keeping the set dry and using forceps (tweezers) are the two habits that keep the pieces reliable.

Beyond weighing, the masses serve as loads in simple force experiments, for example hanging known masses on a spring to show extension increasing with load, or checking the reading of a Mechanical Spring Balance against known values.

Specifications

Care & Handling

• Lift pieces from the weight box with forceps rather than fingers; skin moisture and grease cause rust spots and slight mass changes.
• Return every piece to its own recess straight after use so the set stays complete and can be checked at a glance.
• Store the box closed in a dry cupboard; a sachet of silica gel in the storeroom helps in humid seasons.
• Never wash iron weights; wipe with a dry cloth and remove any rust gently with fine abrasive paper.

Applications

• Finding the mass of small objects with a physical or beam balance
• Teaching the difference between mass and weight (weight = mass x g)
• Loading springs to investigate extension and Hooke’s law
• Checking the zero and scale of spring balances

Why Choose LabEquip

Physics teachers usually order weight boxes to match the number of balances on their benches, so every group can weigh at once. LabEquip lists this box among the General Items in its physics lab equipment range; tell the team how many sets you need via the contact page.

Frequently Asked Questions

Which masses are in the box?

The listing gives the 100 g total but not the breakdown, so confirm the set of pieces when you enquire. Weight boxes of this kind are normally built on a 1-2-2-5 pattern, which lets pieces combine to make any whole-gram value up to the total.

How do iron weights compare with brass weights?

Brass weights resist corrosion and keep their mass better over the years, so they are chosen for more accurate work. Iron weights cost less and are adequate for routine school weighing if they are kept dry and handled with forceps.

Why should weights be handled with forceps?

Fingers leave moisture and oil on the surface. On iron this leads to rust, which slowly changes the mass, and even a fingerprint adds a trace of mass. Forceps also stop pieces being dropped and chipped.

What is the correct way to weigh with a physical balance?

Check the beam balances with both pans empty. Put the object in the left pan and add weights to the right, starting with the largest piece that does not tip the beam too far, then work down to smaller pieces until the pointer rests at the centre.

Can the weights be used in Hooke’s law experiments?

Yes. Hang the masses from a spring in steps, measuring the extension each time. Plotting load against extension gives a straight line up to the elastic limit, and its gradient is the spring constant.

How do I stop the weights from rusting?

Keep the box closed in a dry cupboard, never wash the pieces and wipe off any moisture straight away. If light rust appears, remove it carefully with fine emery paper, and do not oil the pieces, since oil attracts dust and adds mass.

Last Updated: September 2026