confidential1 good afternoon! today we will be learning about temperature, changes, & negative...
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CONFIDENTIAL 1
Good Afternoon!Today we will be learning about
Temperature, changes, & negative numbers
Let’s warm up :
Complete the conversion tables:
Hours 4 7 8
Minutes
1)
Calculate how much time has elapsed between:
2) 5:05 A.M. and 10:10 A.M.?
3) 2:20 P.M. and 5:40 P.M.?
4) 9:40 P.M. and 2:25 A.M.?
CONFIDENTIAL 2
Let’s review the previous topicCalendar and Years
Calendar displays the layout of the dates of a month and their corresponding day of the week of a
particular year.Ordinal Number: A number used to tell order or
position. They are used to say a date in a calendar.
EXAMPLE: 1st, 7th, and 19th, or first, seventh, and nineteenth are ordinal numbers.
June 26 can also be called the
26th of June, or the twenty-sixth.
The layout of the calendar helps to know
dates and their corresponding day in a
particular month.
CONFIDENTIAL 3
Review
A day has 24 hours. There are
7 days in a week.
DAYS
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
A year has 12 months.
MONTH NO. OF DAYS
January 31
February 28
March 31
April 30
May 31
June 30
July 31
August 31
September 30
October 31
November 30
December 31
CONFIDENTIAL 4
ReviewReview
A year is 365 days. But in the Leap year the number of days become 366 as the month February
has 29 days.
The Leap year occur once every four years.The years 2000, 2004, 2008, 2012,………… are Leap
years.Counting with Years
1 decade 10 years
1 century 100 years
1 century 10 decade
1 millennium 1,000 years
1 millennium 10 century
CONFIDENTIAL 5
Suppose today is May 8. How many days is it until Mother’s Day?
You can use a calendar to find the elapsed time.
May 2000
S M T W T F S
1 2 3 4 5 6
7 8 9 10 11 12 13
14Mother’s day
15 16 17 18 19 20
21 22 23 24 25 26 27
28 29 30 31
Count on from May 8 to May 14.
It is six days from May 8 to May 14.
Review
CONFIDENTIAL 6
Review
You can use a calendar to find the elapsed time.
May 2000
S M T W T F S
1 2 3 4 5 6
7 8 9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29 30 31
Suppose today is May 15 How many days is it until June 17?
Count on from May 15 to May 31 .i.e., 17 days in May.
June 2000
S M T W T F S
1 2 3
4 5 6 7 8 9 10
11 12 13 14 15 16 17
18 19 20 21 22 23 24
25 26 27 28 29 30
Step1:
CONFIDENTIAL 7
Review
June 2000
S M T W T F S
1 2 3
4 5 6 7 8 9 10
11 12 13 14 15 16 17
18 19 20 21 22 23 24
25 26 27 28 29 30
i.e.
17 days in May + 16 days in June
= 33 days
Add the number of days in May with number of days before June 17.
Step2:
Therefore,
It is 33 days from May 15 to June 17.
CONFIDENTIAL 8
Review
You can use a calendar to find the Date.
May 2000
S M T W T F S
1 2 3 4 5 6
7 8 9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29 30 31
June 2000
S M T W T F S
1 2 3
4 5 6 7 8 9 10
11 12 13 14 15 16 17
18 19 20 21 22 23 24
25 26 27 28 29 30
Suppose today is May 23. What is the date after 21 days?
Use May 23 as the first day and count on 21 days.
The 21 days after May 23 is June 13.
CONFIDENTIAL 9
Let’s start the topicTemperature, changes, & negative numbers
Temperature: It is a measurement that tells how hot or cold something is.
When the temperature rises, I wear lighter clothing.
There are 2 scales for measuring temperature:
1) Fahrenheit Scale
2) Celsius Scale
The metric system uses the Celsius scale to measure temperature. However, temperatures are still measured on the Fahrenheit scale in the U.S.
CONFIDENTIAL 10
The Fahrenheit Scale and the Celsius Scale measure the same thing
(temperature!), just using different numbers.
If you freeze water, it measures 0° in Celsius, but 32° in Fahrenheit.
If you boil water, it measures 100° in Celsius, but 212° in Fahrenheit.
The difference between freezing and boiling is 100° in Celsius, but 180° in Fahrenheit.
Therefore each degree on the Fahrenheit scale is equal to 100 or 5 degrees on the Celsius scale. 180 9
CONFIDENTIAL 11
Celsius Thermometer Fahrenheit Thermometer
100
80
60
40
20
10
0
-10
210
190
170
110
70
50
30
-20
100
80
60
40
20
10
0
-10
Water Freezes
Normal Body
temperature
Water Boils1000C 2120F
370C 98.40F
00C 320F
CONFIDENTIAL 12
The temperatures below 0°F or 0°C are negative temperatures.
You read 20 degrees Fahrenheit below zero as - 20°F.
Temperatures can be below 0°F or 0°C.
What is the temperature change from 15°F to -50°F?
Step 1: Find the change in temperature from 15°F to 0°F .
The change is 15°F.
CONFIDENTIAL 13
Step 2: Find the change in temperature from 0°F to -50°F.
The change is 50°F.
Step 3: Add the 2 changes.
15°F + 50°F = 65°F.
The temperature change is 65°F.
CONFIDENTIAL 14
Conversion Method
To convert from Celsius to Fahrenheit , first multiply by 180 or 9, then add
32. 100 5
Celsius to Fahrenheit
Celsius to Fahrenheit = (°C × 9) + 32 = °F
5
Fahrenheit to Celsius To convert from Fahrenheit to Celsius, first subtract 32 , then multiply by 100 or 5. 180 9Fahrenheit to Celsius =(°F - 32) x 5 =
°C 9
CONFIDENTIAL 15
Conversion Method
Convert 98.6° Fahrenheit to Celsius.
First: 98.6° - 32 = 66.6
Then: 66.6× 5 = 333 = 37° C 9 9
Therefore,
98.6° F = 37° C
Fahrenheit to Celsius =(°F - 32) x 5 = °C
9
CONFIDENTIAL 16
Conversion Method
Convert 26° Celsius to Fahrenheit.
First: 26° × 9 = 234 = 46.8 5 5
Then: 46.8 + 32 = 78.8° F
Therefore,
26° C = 78.8° F
Celsius to Fahrenheit = (°C × 9) + 32 = °F
5
CONFIDENTIAL 17
Typical Temperatures
°C °F Description
100 212 Water boils
40 104 Hot Bath
37 98.6 Body temperature
30 86 Beach weather
0 32 Freezing point of water
CONFIDENTIAL 18
Assessment
Find the temperature change from:
1) 23°F to -25°F
3) 64°C to -12°C
2) 108°F to -2°F
4) 59°C to -42°C
CONFIDENTIAL 21
Very Good!Let's Review
Temperature: It is a measurement that tells how hot or cold something is.
When the temperature rises, I wear lighter clothing.
There are 2 scales for measuring temperature:
1) Fahrenheit Scale
2) Celsius Scale
The metric system uses the Celsius scale to measure temperature. However, temperatures are still measured on the Fahrenheit scale in the U.S.
CONFIDENTIAL 22
Review
The Fahrenheit Scale and the Celsius Scale measure the same thing
(temperature!), just using different numbers.
If you freeze water, it measures 0° in Celsius, but 32° in Fahrenheit.
If you boil water, it measures 100° in Celsius, but 212° in Fahrenheit.
Therefore each degree on the Fahrenheit scale is equal to 100 or 5 degrees on the Celsius scale. 180 9
CONFIDENTIAL 23
Review
Celsius Thermometer Fahrenheit Thermometer
100
80
60
40
20
10
0
-10
210
190
170
110
70
50
30
-20
100
80
60
40
20
10
0
-10
Water Freezes
Normal Body
temperature
Water Boils1000C 2100F
370C 98.40F
00C 320F
CONFIDENTIAL 24
Review
The temperatures below 0°F or 0°C are negative temperatures.
You read 20 degrees Fahrenheit below zero as - 20°F.
Temperatures can be below 0°F or 0°C.
What is the temperature change from 15°F to -50°F?
Step 1: Find the change in temperature from 15°F to 0°F .
The change is 15°F.
Step 2: Find the change in temperature from 0°F to -50°F.
The change is 50°F.
Step 3: Add the 2 changes.
15°F + 50°F = 65°F.
The temperature change is 65°F.
CONFIDENTIAL 25
Review
Conversion Method
Convert 98.6° Fahrenheit to Celsius.
First: 98.6° - 32 = 66.6
Then: 66.6× 5 = 333 = 37° C 9 9
Therefore,
98.6° F = 37° C
Fahrenheit to Celsius =(°F - 32) x 5 = °C
9
CONFIDENTIAL 26
Review
Conversion Method
Convert 26° Celsius to Fahrenheit.
First: 26° × 9 = 234 = 46.8 5 5
Then: 46.8 + 32 = 78.8° F
Therefore,
26° C = 78.8° F
Celsius to Fahrenheit = (°C × 9) + 32 = °F
5
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