http://www.ck12.org Chapter 2. Matter
Summary
- A liquid is a state of matter in which particles can slip past one another and take the shape of their container.
However, the particles cannot pull apart and spread out to take the volume of their container. - Surface tension is a force that pulls particles at the exposed surface of a liquid toward other liquid particles.
Viscosity is a liquid’s resistance to flowing.
Vocabulary
- liquid: State of matter that has a fixed volume but not a fixed shape.
Explore More
Table2.2 shows the viscosity of water at different temperatures. Use the data in the table to answer the questions
below. The meaning of the units of viscosity is not necessary to appreciate the relationship between temperature and
viscosity.
TABLE2.2:Viscosity of Water at Different Temperatures
Temperature [°C] Viscosity [mPa•s]
10 1.308
20 1.002
30 0.7978
40 0.6531
50 0.5471
60 0.4668
70 0.4044
80 0.3550
90 0.3150
100 0.2822- Describe in words what the data in the table show.
- If you were to draw a line graph of temperature and viscosity, what would it look like? Make a rough sketch to
show how it would look. (Assume that the x-axis represents temperature and the y-axis represents viscosity.) - Write a hypothesis to explain the relationship between temperature and viscosity of water.
Review
- State the properties of matter in the liquid state.
- What property of liquids explains why water beads up on the car surface pictured in theFigure2.28?
- Predict which liquid has greater viscosity: olive oil or motor oil (SAE 40). Then do online research to find out
if your prediction is correct.