Tiêu đề TOPIC 2 MEASUREMENT - WazaElimu.com.pdf ✅

10 Very small lengths are measured in micrometers and nanometers. 1m = 106μm 1m = 109nm APPROPRIATE MEASURING OF LENGTH  The instruments commonly used in a laboratory to measure length include the following i) Meter rule ii) Tape measure iii) Vernier caliper iv) Micrometer screw gauge A VERNIER CALIPER  This is an instrument used to measure small length with a greater degree of accuracy than a metre rule. OR  This is an instrument used to measure length to the accuracy of 0.01cm. STRUCTURE OF THE VERNIER CALIPER  A vernier caliper has a fixed scale (main scale) and vernier scale.  The vernier scale slides along the fixed scale (main scale) hence readings are taken from both scales. The fixed scale (main scale) gives readings in centimeters and millimeters while the vernier scale gives reading in the hundredth of a centimeter. PARTS OF VERNIER CALIPER AND THEIR USES i) Outside jaws.  Used to measure external diameters of objects.  Used to measure the length or thickness of objects. ii) Inside jaws (inner jaws).  Used to measure the internal diameters of hollow and cylindrical objects. iii) Stem stick/depth gauge/depth probe.  Used to measure the depth of objects. iv) Screw clamp.  Used to secure the objects being measured so that the reading does not change while measuring.