How to find the mass of an object without a scale?

You can find the mass of an object without a scale by using the principle of buoyancy or the formula F=ma.

The principle of buoyancy, also known as Archimedes' principle, states that the buoyant force (or upthrust) on an object submerged in a fluid is equal to the weight of the fluid displaced by the object. To use this method, you would need to know the density of the fluid and be able to measure the volume of the fluid displaced when the object is submerged. The mass of the object can then be calculated by multiplying the volume of the displaced fluid by its density.

Another method is to use the formula F=ma, where F is the force applied to the object, m is the mass of the object, and a is the acceleration of the object. If you can measure the force applied to the object and the resulting acceleration, you can rearrange the formula to solve for m (mass), i.e., m=F/a. This method requires a way to measure force and acceleration, which could be done using a spring and a stopwatch, for example.

Both of these methods require some additional equipment and measurements, but they can be used to estimate the mass of an object without a scale. However, it's important to note that these methods may not be as accurate as using a scale, especially for small or irregularly shaped objects. Also, these methods assume that the object is homogeneous (i.e., has a uniform density), which may not be the case for all objects.