The salt is added gradually to the balance until the scale reads 400 grams.
An electronic balance is a kind of weighing balance that is digital in its output. It can be operated with electricity or with a battery.
In order to weigh out 400g of salt, a filter paper is placed on the weighing balance and the scale is it is set to zero. The salt is now added to the filter paper gradually until the weighing balance reads 400 grams.
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