Consider the production and use of single-use, plastic shopping bags, and examine their flows al

Consider the production and use of single-use, plastic...

Key Concepts

Life Cycle Assessment

This concept involves evaluating the environmental impacts associated with all stages of a product’s life—from raw material extraction through manufacturing, distribution, use, and ultimate disposal or recycling. It provides a comprehensive framework for understanding the overall sustainability implications of a product.

Material Flow Analysis

Material Flow Analysis (MFA) is a method for tracking the inputs, outputs, and accumulation of materials within a system over time. It is used to analyze and quantify the flows of resources and wastes across different stages of production and consumption, helping to identify inefficiencies and environmental burdens.

Production and Supply Chain Dynamics

This concept covers the processes and pathways through which raw materials are converted into final products and delivered to consumers. It includes understanding the stages of extraction, manufacturing, distribution, utilization, and end-of-life management, all of which are crucial for assessing a product’s overall impact.

Environmental Impact Evaluation

Environmental Impact Evaluation involves assessing the potential consequences of a product on ecosystems, human health, and resource depletion across its entire life cycle. It compares different materials and processes to highlight their respective contributions to pollution, waste generation, and overall sustainability.

Comparative Analysis of Materials

Comparative Analysis of Materials is the examination of the differences between alternative materials—in this case, plastic and paper—in terms of production requirements, energy use, environmental impacts, and end-of-life handling. This approach supports decisions aimed at reducing negative environmental outcomes.

Transcript

00:01 So this tutorial goes through solving question 116 in chapter one section two.

00:06 And we're given the pictures and dimensions of a pillow or the amount of things needed to make a pillow.

00:14 And we're given how much of that information or how much of those materials are in stop.

00:17 And then we're asked to figure out how many pillows we could make with the available materials.

00:23 And so what we're going to do is we're going to take the amount of material we have.

00:28 And we're going to split it into and see how many groups we can.

00:31 Can make of the required sizes.

00:33 So let's start with lace.

00:35 So i'm given 135 yards of lace.

00:39 There we go.

00:40 All right.

00:41 So 135 yards of lace and i want to split it or divide it into the necessary smaller lengths, which are nine tenths of a yard.

00:50 So that's, if i divide it, it's going to tell me how many of those i can make.

00:54 So i'm going to need to rewrite 135 as an improper fraction.

00:58 And then i can apply the fraction division algorithm, which is that you multiply by the reciprocal of the second fraction.

01:10 So 135 over 1 divided by 9 tenths is the same as 130, sorry, 135 over 1 times the reciprocal, which is 10 over 9.

01:19 So i know that i have, let's see, 135, i can divide that by 5, and that's going to give me five times 27 times 10 and then nine is three times three and then i know that 27 is actually nine times three and so i can factor out my common factors here and so i am left with of nine sorry nine is three times three times three, not nine times three.

02:03 There we go.

02:03 All right, so there we go.

02:05 So five times nine times three times ten and here we have three times three.

02:15 So i can factor out my common factor of three.

02:23 There we go.

02:24 And then i can rewrite this as five times three times three times ten over three.

02:32 And i still have another common factor.

02:35 So now i'm left with 5 times 3 times 10, which is 150.

02:39 So i can make 150 lace borders from the material i have.

02:45 So now let's work the second information, which is the fabric...