« previous next »

Author Question: When a mercury-in-glass thermometer is placed in boiling water, the mercury level falls slightly at ... (Read 123 times)

khang

  • Hero Member
  • *****
  • Posts: 569
on: Jul 28, 2018
When a mercury-in-glass thermometer is placed in boiling water, the mercury level falls slightly at first and then begins to rise. Explain this effect. If you have lab time, perform the experiment. Obtain the lab instructor's permission.

Question 2

Two wires A and B with circular cross sections are made of the same metal and have equal lengths, but the resistance of wire A is three times greater than that of wire B. What is the ratio of the radius of A to that of B?
  1.3
  2.3
  3.1
  4.1/3
  5.1/3


rnehls

  • Sr. Member
  • ****
  • Posts: 313
Reply #1 on: Jul 28, 2018
Answer to Question 1

Because the mercury is enclosed in the glass bulb, the glass bulb is the first to
become hot and expand. The larger glass volume allows the mercury to fall. Once the
mercury itself begins to receive heat, it expands rapidly and rises again to the
maximum level.

Answer to Question 2

4


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Common abbreviations that cause medication errors include U (unit), mg (milligram), QD (every day), SC (subcutaneous), TIW (three times per week), D/C (discharge or discontinue), HS (at bedtime or "hours of sleep"), cc (cubic centimeters), and AU (each ear).

Did you know?

The U.S. Pharmacopeia Medication Errors Reporting Program states that approximately 50% of all medication errors involve insulin.

Did you know?

Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

Did you know?

Everyone has one nostril that is larger than the other.

Did you know?

The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.

Xeriscaping Conserves Water Xeriscaping Conserves Water
Is breathing water dangerous? How do you know? Is breathing water dangerous? How do you know?
A gasoline testing kit, including an insulated container where water at 100°F is used to heat a ... A gasoline testing kit, including an insulated container where water at 100°F is used to heat a ...
The arrangement of water molecules in (a) solid ice, and (b) liquid water. The arrangement of water molecules in (a) solid ice, and (b) liquid water.
Nutrients Are Transported through the Circulatory and Lymphatic Systems Water-soluble nutrients Nutrients Are Transported through the Circulatory and Lymphatic Systems Water-soluble nutrients
The water cycle The water cycle
Video: T cell receptors

For a complete list of videos, visit our video library