"Temperature" Changes in State of Matter PPT Courseware 9

Description

"Temperature" Changes in State of Matter PPT Courseware 9

To accurately reflect the coldness and heat of an object, how cold it is and how hot it is, in physics - it is expressed by the physical quantity temperature.

Temperature: The degree of hotness or coldness of an object is called temperature.

Thermometer principle:

Thermometers commonly used in homes and laboratories are made based on the laws of thermal expansion and contraction of liquids.

Classification of thermometers:

(1) Divided according to the liquid used: mercury thermometer, alcohol thermometer, kerosene thermometer, etc.;

(2) Divided according to use: experimental thermometers, body thermometers, thermometers, etc.;

How is Celsius temperature determined?

0 degrees Celsius is defined as follows:

a. At one atmospheric pressure, the temperature of the ice-water mixture is 0°C.

100 degrees Celsius is defined as follows:

b. At one atmospheric pressure, the boiling temperature of water is 100°C.

The highest temperature and lowest temperature that a thermometer can measure - that is, the range.

The temperature value represented by each small grid - that is, the graduation value

practise

1. The correct pronunciation of -20℃ is [ ]

A. minus 20 degrees B. minus 20 degrees Celsius

C. Negative 20 degrees Celsius D. minus 20 degrees Celsius

2. The normal human body temperature (oral temperature) is approximately ______, pronounced ______.

Use a thermometer correctly:

1. Observe the range and graduation value of the thermometer;

2. The glass bulb of the thermometer is completely immersed in the liquid being measured, and does not touch the bottom or wall of the container;

3. Wait for a while after the glass bulb of the thermometer is immersed in the object to be measured, and then take a reading after the thermometer's reading is stable;

4. When reading, the glass bulb of the thermometer should remain in the liquid, and the line of sight should be level with the upper surface of the liquid column in the thermometer.

practise

1. Temperature is a physical quantity that represents ______. Commonly used thermometers measure temperature based on the properties of ______. The letter C on the thermometer indicates that the ______ temperature is used. It specifies the temperature of ______ as 0℃, and _____ The temperature of _ is specified as 100℃.

2. The normal human body temperature is approximately ______, pronounced ______.

3. The measuring range of the thermometer is ______, and the minimum division value is ______.

4. In the following about the use of commonly used thermometers, the incorrect one is [ ]

A. A thermometer cannot be used to measure temperatures above its maximum scale;

B． The glass bulb of the thermometer must be in full contact with the object being measured;

C. When measuring the temperature of a liquid, the thermometer glass bulb must be completely immersed in the liquid;

D． When taking a reading, remove the thermometer from the liquid and take another reading.

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Update Time: 2024-10-19

This template belongs to Physics courseware Lu Jiao Edition Ninth Grade Physics Volume 2 industry PPT template

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