Answer:
Tare
Explanation:
The correct word to fill the gap would be 'tare'.
In tare technique of weighing, the container is first placed on the weighing balance and its weight is zeroed by pressing the tare button on the weighing balance. Thereafter, the sample whose weight is to be determined is carefully placed in the container while still on the weighing balance. This will allow one to only see the mass of the sample.
