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<p>[QUOTE=&quot;cwtokenman, post: 92524, member: 2100&quot;]Morgan, good questions and thoughts! Unknown criteria as to the glass&#039;s intended usage and its actual design could certainly allow for tremendous sway either way as to best actual size. While a 2 SF can often be good for many applications, that may not be enough in some situations, as well as too much in others. Each scenario (or type of scenario) needs an independent evaluation to be truly accurate.</p><p><br /></p><p>I feel a 2 SF is a bit high for general drinking glass usage. I know if I ordered a pop (soda for some) from McBurger&#039;s, and it was only &quot;half&quot; full, I would feel slighted and definitely would initiate a conversation to receive the rest of my portion. I suspect most customers would behave in a similar fashion. </p><p><br /></p><p>I agree with your &quot;at least 95 percent confidence interval&quot; for a 2 SF, probably more like 99.9. Assuming glass usage is only by &quot;normal&quot; adults, spillage with that type of SF would almost be relegated to a stumble, or perhaps thoughtlessly checking the time on their wrist watch (being worn on the glass holding appendage). In such cases, even a higher SF would not likely prevent spillage. Such a scenario as I am envisioning would be wasteful of construction material(s) in making the glass, and hence would not be well engineered. However, other scenarios may benefit from a high SF, such as when young children are involved, or those with certain health issues. Or a lid could be used rather than a high SF. A lid has definite advantages while sipping those hot drinks when driving.</p><p><br /></p><p>I base my claim that the glass is twice as big as it needs to be on the following reasoning:</p><p><br /></p><p>1. Even a &quot;full&quot; glass typically is not filled clear to the rim of the glass, but some volume is left unused. This is typically a small SF, and will vary depending on the filler and their skill at filling and skill of the glass user. (I suppose that is why some food vendors dispense pre-determined amounts of drink, to reduce the variables.)</p><p><br /></p><p>2. Assumption is made that the filler has understanding of cause/result/possibility of spillage, and would allow a SF that they feel is suitable and acceptable for the situation upon filling the glass.</p><p><br /></p><p>3. Half of the &quot;full&quot; volume of liquid would be the &quot;half&quot; glass, somewhat less than one half the actual volume of the glass.</p><p><br /></p><p>4. Spillage due to sloshing of the liquid in the glass is affected by a number of variables - viscosity, volume, depth, additives (ice, straws, lemons, etc.) to name but a few. Volume and depth are variables which would change when going from a full glass to a half glass, both generally tending to reduce the liklihood of spillage. Hence, IMO, the SF may be reduced as well if so desired. But even if the SF is left the same, the unused volume of the glass can still be halved from the full state.</p><p><br /></p><p>5. Size of the needed glass is only being considered for the &quot;half full&quot; or &quot;half empty&quot; scenarios commonly cited.</p><p><br /></p><p>6. Hence, I deduce that if the glass and amount of liquid were half of their original amounts, the smaller glass would still perform as well or better than the larger glass containing twice the volume.</p><p><br /></p><p>Now if you go back for a refill, there may be a problem. :mouth:[/QUOTE]</p><p><br /></p>

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