第二十一课

 21Volume cylinder量筒

Questions and speculation问题与猜测

How do you know which container has too much water? 怎样知道哪个容器里的水多?

What tools can you measure accurately? 使用什么工具能准确测量呢?

My approach is to do …我的办法是...

Exploration and Practice探究与实践

Understanding cylinder认识量筒。

zero0

50ml

TC20C

range 量程

50ml

unit单位

zero0

fifty50

degree scale刻度

Jane is a tool used for measuring the liquid volume要简是用来测量液体体积的工具。

Liquid volume is generally used in ml of unit液体体积一般用毫升作单位，

By the symbol " ml". 用符号“"ml”表示。

●measures the volume of water.用量简测量水的体积。

One selection一选

Three Look三看

Second inverted二倒

Method guidance方法指导

1.chooses the appropriate range of volume Jane, the volume Jane slightly tilt, the bottle mouth close to the volume cylinder mouth, so that the water slowly flow into the volume Jane.选用合适量程的量简，将量简微微倾斜，瓶口紧挨量筒口，让水缓缓流入量简内。

2.When reading, the volume reduction must be smooth, and the line of sight should be kept at the lowest level of the concave surface of the water in the volume reduction cylinder. 读数时，量简必须放平稳，视线要与量简筒内水的凹液面的最低处保持水平。

How to measure 70ml of liquid estimation more accurately怎样量取70ml的液体估测更准确。

Measurement measurement is more accurate than estimation. 用量筒测量比估测更准确。

Method guidance方法指导

1.Select of of appropriate appropriate range选用合适量程的量简。

2.When the liquid enters the 70mal scale line, switch to drain the liquid, gradually add. 倒入液体接近70mal 刻度线时，改用滴管取液体，逐渐滴加。

Expansion and Innovation拓展与创新

Make simple measuring. 制作简易量筒。

I wanted to make a range that is a simple cartridge of 200ml. 我想制作一个量程是200ml的简易量筒。

It is important to determine the scale of the确定刻度很重要

Mind - based navigation思维导航

1. How do you determine the 50ml scale on the cup? 怎样确定50ml刻度在杯子上的位置?

2.How do you determine the 10ml scale on the cup? 怎样确定10ml刻度在杯子上的位置?

Our team of our the determine determine scale scale scale我们小组确定刻度位置的方法是....

Show our work展示我们的作品吧.

●Know more tools for measuring the liquid volume. 认识更 多的测量液体体积的工具。