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Description:

safe1659991 artist:lumineko2783 starlight glimmer47238 trixie65802 pony924138 unicorn304637 all bottled up1400 anger magic187 angry26136 bad idea98 cup6040 dialogue63071 duo56979 female1322823 glowing horn18778 magic70963 mare459021 mini twilight9 patreon12322 patreon logo8523 speech bubble22163 teacup2804 that pony sure does love teacups294 that was fast1357

Comments

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The Smiling Pony
Magnificence - Artist with 100+ Safe/Suggestive images with over 100 upvotes, and 5+ Questionable/Explicit images with over 350 upvotes
My Little Pony - 1992 Edition
The Magic of Friendship Grows - For helping others attend the 2020 Community Collab
Friendship, Art, and Magic (2020) - Took part in the 2020 Community Collab
The Power of Love - Given to a publicly verified artist with an image under their artist’s tag that has reached 1000 upvotes
Dream Come True! - Participated in the MLP 9th Anniversary Event
Toola Roola - For helping others attend the 2019 Community Collab
Friendship, Art, and Magic (2019) - Celebrated Derpibooru's seventh year anniversary with friends.
Condensed Milk - State-Approved Compensation
Friendship, Art, and Magic (2018) - Celebrated Derpibooru's six year anniversary with friends.

INFINITE DISAPPOINTMENT
@ArtColter
The pressure change from a bunch of small items increasing or decreasing volume by, let's say half, as we saw in that scene would be less radical than that of someone abruptly opening a door.
ArtColter
Magical Inkwell - Wrote MLP fanfiction consisting of at least around 1.5k words, and has a verified link to the platform of their choice
Not a Llama - Happy April Fools Day!
Artist -

@Nightweaver20xx

@Meanlucario
Starlight did say that nothing can simply "disappear", implying that magic cannot simply cause mass to cease existing. This implies that the mass has to go somewhere. What it is turned into is then up for debate. When MeanLucario says "a lighter element" I presume that they mean some type of gas. It is possible that the excess mass is converted into something like hydrogen, helium, oxygen, or nitrogen (or a combination thereof) which would simply become part of the atmosphere. This would probably cause problems in our world, but in Equestria, where pegasi are in charge of controlling the weather, they may have a process by which they can balance out the air elements. (This would also explain the high difficulty of a transmutation spell, as the unicorn in question not only has to change the object's shape, size, mass, etc., but also be able to convert the excess mass into lighter gasses in an instant.)

Furthermore, if my above theory is accurate, what Trixie did in the "Teacup Scene" is extremely dangerous, as converting so much excess mass at once could drastically change the air pressure of the room, which could cause difficulty in a pony being able to breathe. (The pressurized air may force itself into the ponies' lungs, or vice-versa, where the air would not be able to be exhaled, due to the pressures.)
ArtColter
Magical Inkwell - Wrote MLP fanfiction consisting of at least around 1.5k words, and has a verified link to the platform of their choice
Not a Llama - Happy April Fools Day!
Artist -

@Nightweaver20xx
Pretty sure the Law of Conservation of Mass doesn't apply in Equestria. We've seen Pinkie break this law of physics multiple times, whether it be by pulling objects out of thin air or the ability to change her own mass (that is to say, change how gravity affects her body). Also, in that very episode, Trixie changed iron pans into teacups. When they fell to the ground, there was no sound of shattering or anything like that, implying that they become the light weight of a teacup.
Nightweaver20xx
My Little Pony - 1992 Edition
Wallet After Summer Sale -
Birthday Cake - Celebrated MLP's 7th birthday
Happy Derpy! -
Platinum bit -
Emerald -
Artist -

Evil
@09MurphyM
I wonder if in the ponyverse, in order to transmute one object into another, all mass must be conserved. So, if Trixie were to transform Starlight into a teacup, that cup would weigh like 60 pounds or whatever Glimmy weighs.

These are the things I think about, folks.
Background Pony #2AC5
Now I have a craving for Starlight kills Trixie material after this episode.