Download presentation

1
UNIT II.1 Unit Conversions

2
II.1 Unit Conversions You MUST learn and use the unit conversion method (not your own method!) A CONVERSION FACTOR: is a fractional expression relating or connecting two different units.

3
II.1 Unit Conversions Example 1: There are 60 seconds in 1 minute. In statement form, 1 min = 60 sec Conversion Factors: The conversion factor relates 2 units (minutes to seconds).

4
**II.1 Unit Conversions Example 2: $1.44 per dozen eggs.**

Conversion Factors: Conversion factors do not change the VALUE of something, they just change the UNITS. To change the UNITS, multiply by the CONVERSION FACTOR.

5
**II. 1 Unit Conversions THE UNIT CONVERSION METHOD:**

We need 3 important pieces of information: unknown amount and units initial amount and units conversion factor (relating the initial units to units of unknown)

6
**II. 1 Unit Conversions Example 3: How many seconds are in 20 minutes? **

Unknown amount: Initial amount: Conversion factor: Solution ** ALWAYS include UNITS in your calculations!

7
II.1 Unit Conversions Example 4: If a car can go 90km in 1 h, how far can the car go in 6.5 h? Unknown amount: Initial amount: Conversion factor: Solution

8
II.1 Unit Conversions Example 5: If the price of gas is $1.10 per liter (l), how much will it cost to fill a 40 liter tank? Unknown amount: Initial amount: Conversion factor: Solution

9
**II.1 Unit Conversions HOW TO PUT EVERYTHING TOGETHER**

The general form of a unit conversion calculation is: (Unknown amount) = ( Initial amount) x (Conversion factor)

10
**II.1 Unit Conversions Example 6**

a. If mL of gold has a mass of 3.86 g, what is the mass of 5.00 mL of gold? Unknown amount: Initial amount: Conversion factor: Solution

11
II.1 Unit Conversions *Important: Always ask yourself “which way do I have to write the conversion factor so that my units cancel properly?” b. If mL of gold has a mass of 3.86 g, what is the volume occupied by g of gold? Unknown amount: Initial amount: Conversion factor: Solution

12
**II.1 Unit Conversions SUMMARY**

Identify unknown amount and its units (put on left side of = sign). Identify the initial amount and its units (put on right side of = sign). 3. Identify conversion factor. (Multiply initial amount by conversion factor in such a way that one of the units cancel. You want to be left with units of unknown amount!) 4. Complete the problem by multiplying and/or dividing amounts of RHS.

13
Assignment

14
**II.1 Unit Conversions Multiple Unit Conversions **

We can solve problems that require more than one conversion factor. Example: If eggs are $1.44 per dozen, and if there are 12 eggs in a dozen, how many individual eggs can be bought for $4.32? ANALYZE THE PROBLEM: Unknown amount: Initial amount: Conversion factors:

15
**II.1 Unit Conversions Solution: we require the connection**

conversion factor 1 gives the connection: conversion factor 2 gives the connection: Combining conversion factors 1 and 2 gives:

16
**II.1 Unit Conversions Solve for unknown amount: Unknown amount =**

Initial amount x Conversion factors (1 and 2)

17
Assignment

Similar presentations

OK

Objectives To learn how dimensional analysis can be used to solve problems To learn the three temperature scales To learn to convert from one temperature.

Objectives To learn how dimensional analysis can be used to solve problems To learn the three temperature scales To learn to convert from one temperature.

© 2018 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google