"Temperature" Changes in State of Matter PPT Courseware 2

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"Temperature" Changes in State of Matter PPT Courseware 2

Practice questions

All sound-producing objects ________. When your fingers pluck the strings, the strings __________ and produce sound.

The propagation of sound requires __________. Solids, liquids, and gases can all be used as sound transmission media. Sound propagates fastest in __________ and slowest in __________. Vacuum __________ transmits sound.

The distance that sound travels per second is called __________. The speed of sound is related to the ________ and __________ of the medium. The speed of sound in air at 15°C is __________.

Pitch refers to the ________ of a sound, which is related to the ______ of the sound-emitting body. If an object vibrates fast, the tone it emits is ________; if it vibrates slowly, the tone it emits is ________. In physics, the number of vibrations per second is called ________, its unit is ______, and its symbol is _______.

Loudness refers to the ________ of sound, which is related to the ______ of the sound emitter.

Different sound-emitting bodies have different materials and structures, and the _________ of the sounds they emit is different.

1. Temperature and Celsius

Hot objects have a high temperature and cold objects have a low temperature.

In physics, the degree of hotness or coldness of an object is usually called temperature.

In what situations do we refer to temperature?

The temperature in Dali is _______ The temperature in Kunming is _______

Celsius

The temperature of the ice-water mixture at standard atmospheric pressure - 0°C

The temperature of boiling water at standard atmospheric pressure - 100°C;

Divide into 100 equal parts between 0 ℃ and 100 ℃, each equal part represents 1 ℃.

2. Temperature measurement tools and their use

Place the vial into hot water and observe the position of the water column in the thin tube;

Then put the vial into hot water and observe the position of the water column in the thin tube.

Principle: Thermal expansion and contraction of liquids

Using this principle, a temperature measurement tool was made

3. Thermometer

Why can a thermometer take readings after leaving the human body?

The glass tube of the thermometer is thin, and there is a very thin curved constriction between the glass bulb and the straight glass tube.

The mercury in the glass bubble expands when heated and rises into the straight glass tube through the constriction;

After leaving the human body, mercury shrinks when it is cold, but the mercury column in the straight glass tube has no time to retreat back to the glass bubble and breaks at the shrinkage, still indicating the original temperature.

Practice questions

The correct way to disinfect a thermometer is ( )

A. Boil in boiling water. B. Use alcohol lamp to heat.

C. Rinse with tap water. D． Wipe with alcohol cotton.

The range of thermometers used at home is ( )

A. 0℃～100℃． B. 35℃～42℃．

C. -10℃～100℃． D． -20℃～50℃

When an unscaled thermometer is placed in a mixture of ice and water, the mercury column will be 20cm long after stabilization. Insert it into boiling water under standard atmospheric pressure. The mercury column will be 40cm long after stabilization. Put it into a liquid and the mercury column will be 40cm long. The column is 25cm long after stabilization. The temperature of the liquid is ______°C.

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Update Time: 2024-10-03

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 1 industry PPT template

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