Which instrument is used to hold substances while weighing?

• A. Weighing dishes/boats
• B. Thermometer
• C. Pipette
• D. Funnel

Answer: (A)

Holding the substance on a removable, weigh-ready surface is essential for accurate mass measurements. A weighing dish or boat is designed for this role: you place the empty dish on the balance, tare it to zero, and then add the substance. The mass read is only the material, since the container’s weight has been subtracted. This setup prevents contamination, keeps the balance clean, and ensures precise results. The other tools serve different functions—thermometers measure temperature, pipettes transfer precise volumes of liquid, and funnels guide materials but aren’t used to weigh substances.