W E I G H I N G S U B S T A N C E S M E A S U R I N G V O L U M E S Tu rn on the sca les and wa it unt i l the d isplay reads 0. Put the conta iner on the tray. Press the tare but ton. The d isplay w i l l retu rn to 0. Don't put the substances d i rect ly on the sca les. Put them in a g lass or ceramic conta iner. Don't tu rn of f or change the sca les wh i le weigh ing! You wou ld lose the ta re and it wou ld g ive an incor rect mass. You can weigh sol ids or l iqu ids. I f you use a g raduated cyl inder, to read the measu rement accu rately, place it on a f lat su r face. Your eyes shou ld be at the lowest level of the meniscus. Don't use bea kers or Erlenmeyer f lask s because thei r measu rements a re not accu rate. To measu re the exact volume of a l iqu id , use g raduated cyl inders, pipet tes, or bu ret tes. The meniscus is the cu r ve that forms on the su r face of a l iqu id that is inside a conta iner. 1 1 Meniscus The negative value is the mass of the container. Ta ke the conta iner of f the sca les. Put the substance you want to measu re in it . Put the conta iner on the sca les. Read the mass. 2 3 Reading (lower part of the meniscus) 27
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