Table of Contents
- 1 Why does the level of mercury rise when it comes in contact with hot object?
- 2 What is the reason for the rise of the mercury thread in the thermometer when the bulb is dipped in hot water?
- 3 When the temperature rises the mercury level in the thermometer?
- 4 What happens to mercury when temperature increases?
- 5 Why does a mercury thermometer go up and down in a hot liquid?
- 6 How is the rate of expansion of mercury determined?
Why does the level of mercury rise when it comes in contact with hot object?
What is the reason for this rise in the level of mercury? Mercury gets expanded on heating, hence its level rises in the capillary when comes in contact with a hot object.
What is the reason for the rise of the mercury thread in the thermometer when the bulb is dipped in hot water?
It consists of a bulb containing mercury which is then attached to a narrow glass tube. As temperature rises, the level of mercury in the tube increases. This happens because the volume of mercury slightly increases with temperature.
What causes the liquid in a thermometer to rise?
When heated, the molecules of the liquid in the thermometer move faster, causing them to get a little further apart. This results in movement up the thermometer.
What happens when the thermometer is placed in contact with any object?
When a thermometer is placed in contact with an object and reaches thermal equilibrium, we have a quantitative measure for the temperature of the object. For instance, when a thermometer is placed under the arm of an infant, heat is transferred until thermal equilibrium is reached.
When the temperature rises the mercury level in the thermometer?
Answer: The reason for rising of mercury is that it expands on heating, when we put the bulb of thermometer under our armpit the heat of our body is transfered to the bulb which is then transfered to mercury.
What happens to mercury when temperature increases?
As the temperature rises, the mercury is pushed up through the constriction by the force of expansion.
How does a mercury thermometer work?
In a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked on the tube. With changes in temperature, the mercury expands and contracts, and the temperature can be read from the scale. Mercury thermometers can be used to determine body, liquid, and vapor temperature.
Why does the mercury not fall or rise in a clinical thermometer when taken out of the mouth in Brainly?
In clinical thermometers, there is a small bent at the bottom of the tube containing mercury. It is called a kink. The kink prevents the mercury level from falling down on its own. Due to this, the temperature does not decrease immediately after removing the thermometer from the mouth.
Why does a mercury thermometer go up and down in a hot liquid?
When a mercury thermometer is immersed in a hot liquid, the mercury level goes down at first and then goes up. Why? There are two physical properties that affect the thermometer as it comes into thermal equilibrium with the body in which the temperature is to be measured.
How is the rate of expansion of mercury determined?
Eventually the glass comes into thermal equilibrium and ceases to expand while the mercury continues to expand until it too comes into thermal equilibrium with both the glass and the body. The rate of the expansion of the mercury is determined by in part by the thermal conductivity of the glass.
What is the purpose of a thermometer in science?
Thermometers are widely used in medicine and science laboratories. The purpose of a thermometer is simple and it is just to give the temperature of the object it is in contact with.
Which is more thermal conductivity glass or mercury?
Glass has a relatively low thermal conductivity, approximately 1 W/ (m-°C), and a low volume expansion coefficient, approximately 10 -5 (°/C) while mercury has a volume expansion coefficient of about 10 -4 (°/C), a factor of 10 greater than glass.