شرح ساينس الصف السادس الابتدائي لغات - الفصل الدراسي الأول
شرح ساينس سادسة ابتدائي - ترم أول

لينك تحميل الملزمة
https://drive.google.com/file/d/138cQPwVT8K2IdCvjkw9ev8DVxDCN9fDO/view?usp=sharing

لينك تليجرام
https://t.me/mrahmedelbashagroup

In This Lesson:
Making a Thermometer
In this activity, you will make a model of a thermometer.
Tools:

Steps:
1. Add three drops of red dye to the plastic bottle.


2. Put the straw in the bottle and fix it by using the clay as shown, then measure the height of red liquid in the straw at room temperature.


3. Place the plastic bottle into a bowl of hot water and measure the height of the red liquid in the straw.


Observation:
The height of the red liquid in the straw increases when the bottle is placed into the hot water.

4. Place the plastic bottle into a bowl of cold water and measure the height of the red liquid in the straw.

Observation
The height of the red liquid in the straw decreases when the plastic bottle is placed into the cold water.


Conclusions:
► Ina bowl of hot water,
• The temperature of red liquid increases, so the molecules of red liquid spread out
and the spaces between them increase.
• This leads to the expansion of the molecules of red liquid and increase in the
height of red liquid in the straw.

► In a bowl of cold water,
• The temperature of red liquid decreases, so the molecules of red liquid come
close together and the spaces between them decrease.
• This leads to the contraction of the molecules of red liquid and decrease in the
height of red liquid in the straw.

 
Engineers use some techniques to protect bridges and railroad tracks from expansion or contraction in different conditions of weather.

Examples:
1. In bridges:
- When the temperature increases in hot weather or decreases in cold weather, the metal that made up bridges expands and contracts.
- So, engineers use expansion joints to keep bridges safe over time.


2. In railroad tracks:
- Railroad tracks are made of iron.
- Engineers leave small spaces between the railroad tracks to allow these tracks to expand in hot weather without being bent to avoid train accidents.






بالتوفيق
مستر احمد الباشا