What error can occur in the mass determination of an object if it is warm?

When a warm object is placed on a balance, it can create air currents around it as the heat rises and interacts with the cooler air in the environment. These convection currents can cause fluctuations in the balance reading, leading to inaccuracies in the mass measurement.

When a scale is balanced and a warm object is added, the heat can disrupt the stable conditions necessary for accurate measurements. As the warm air moves around, it can cause the scale to react in unpredictable ways, leading to readings that do not accurately represent the true mass of the object. This principle is critical in laboratory settings, where precise measurements are essential, and environmental factors need to be controlled to ensure accuracy.

In contrast, a cold object would generally not create such currents, thus contributing to more accurate readings. Therefore, a warm object can indeed adversely affect mass determination, making the assertion about air currents being a factor in measurement accuracy correct.