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Collin College BIOL 1408 Unit 1 Measurement and Lab Equipment Packet
- Course
- BIOL 1408
- Institution
- Collin College
Collin College BIOL 1408 Unit 1 Measurement and Lab Equipment Packet
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Unit 1Measurement & Lab Equipment
Abstract
This lab reviews the concept of scientific measurement, which you will employ weekly
throughout this course. Specifically, we will review the metric system so that you will be
able to measure length, mass, volume and temperature in metric units, and convert
between the English and metric systems. You will also familiarize yourself with common
laboratory equipment. You will review and practice scientific notation so that you will
understand its use in scientific measurement. Finally, you will utilize basic statistical
methods to evaluate data that you gather and graph.
The sections entitled “Put what you have read into Practice” will be due as homework
next week. Whatever you do not complete during the lab period should be completed at
home.
1.1 Conversions within the Metric System
Introduction
Length, Mass, Volume
To convert within the metric system, you must remember the following:
Base
k h da d c m µ n p
Units
meters,
kilo hecto deka liters, deci centi milli micro nano pico
grams
103 102 101 100 10-1 10-2 10-3 10-6 10-9 10-12
To convert between metric units, you will need to move the decimal to the right or to the
left, relative to where you begin, as shown by this chart. This means that you will need to
add a decimal to the end of any whole number! For instance “35” is the same as “35.”
Example 1: Convert 5 mg to g. To get from mg to g requires you to move to the left on
the chart 3 units, thereby moving the decimal to the left 3 units. Therefore the value will
be 0.005 g.
3
, Example 2: Convert 80 hectoliters to centiliters. To get from hecto to centi requires you
to move to the right 4 units. Therefore the number will become 800000 hl.
Example 3: Convert 400 ml to nl. To get from milli to nano requires you to move 6 units
to the right. Notice that we are referring to the exponent associated with 10 when we
count places to move the decimal- we are not counting actual words listed on the chart.
Therefore 400ml becomes 400,000,000 nl.
Tip
Make sure you look at your answer to see if it makes sense! Does it make sense that
1 liter is the same as 0.001 ml?! No, because milliliters are smaller units than liters!
Therefore you would know that you had moved the decimal the wrong way. One liter
is equal to 1000 ml.
Important conversions to know about water under standard conditions!
1 cc = 1ml 1dm3 = 1 liter
1 ml = 1 g 1 liter = 1 kg
This means that 50 ml of water weighs 50 g.
Also, 3 liters of water equals 3 kg.
Check your understanding
If you weigh 142 ml water, how many mg would it equal? ___________________
Temperature
Temperature can be measured in Fahrenheit or in Celsius. Here in the US we are used to
thinking of temperature in terms of °F. In science we evaluate temperature using the
Celsius scale. It is called the centigrade thermometer because there are 100 (centi)
degrees between the freezing (0°C) and boiling point (100°C) of water. To convert
between the two, use the following conversions:
From Fahrenheit to Celsius: Equations
1. Subtract 32 from degrees Fahrenheit
2. Multiply by 5
3. Divide by 9 5
From °F to °C ℃ = (℉ − 32)
9
From Celsius to Fahrenheit:
1. Multiply degrees Celsius by 9 9
2. Divide by 5 From °C to °F ℉ = ℃ + 32
3. Add 32 5
4
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