# Bulk Properties of WaterPage 1

Slide 1

## Properties of Water

The first image taken by humans of the whole Earth. Photographed by the crew of Apollo 8, the photo shows the Earth at a distance of about 30,000 km. Space has no respect for “North” and “South” as the southern most tip of South America is at the top of the photo.

Slide 2

## Boiling Point and Freezing Point

Source: CRC Handbook of Chemistry and Physics

Slide 3

Source: NOAA

Slide 4

## Density

Water reaches a maximum density of 1.00 g/cm3 at a temperature of 3.98C.

Water expands (becomes less dense) as it freezes

Slide 5

Rock Weathering

The expansion of freezing water exerts sufficient force to fracture rock, and is a significant cause of rock weathering.

Slide 6

## Water’s Thermochemistry

Specific heat and Latent heat of phase change, as they apply to water.

Slide 7

## Units for Measuring Heat

The Joule is the SI system unit for measuring heat:

The calorie is the heat required to raise the temperature of 1 gram of water by 1 Celsius degree

The British thermal unit (BTU or Btu) is the amount of energy needed to heat one pound of water by one degree Fahrenheit.

Slide 8

## Specific Heat

The amount of heat required to raise the temperature of one gram of substance by one degree Celsius.

Slide 9

Specific Heat

The amount of heat required to raise the temperature of one gram of substance by one degree Celsius.

Slide 10

## Specific Heat and Climate

How does water contribute to the moderation of climate in coastal communities?

Santa

Barbara

CA

Slide 11

## Calculations Involving Specific Heat

cp = Specific Heat

Q = Heat lost or gained

T = Temperature change

OR

m = Mass

Slide 12

## Energy and Phase Change

Along LEG ‘A’ water exists as a solid (ice), and the temperature increases as energy is absorbed.

Go to page:
1  2  3