2009: Hertzsprung-Russell Diagram - Revision history

Elektrizikekswerk: /* Explanation */ wiki link

2024-07-02T10:47:04Z

‎Explanation: wiki link

JLZ0kTC5 at 10:41, 20 November 2022

2022-11-20T10:41:01Z

Mushrooms: why was it written in first person??

2022-09-29T10:20:44Z

why was it written in first person??

Kev: /* Table */

2022-07-31T15:43:36Z

‎Table

Kev: /* Table */

2022-07-31T15:40:19Z

‎Table

Kev: Added missing text to table, removed tag

2022-07-31T15:39:22Z

Added missing text to table, removed tag

Esogalt: /* Table */ Typo.

2022-06-07T01:15:59Z

‎Table: Typo.

172.70.114.71 at 22:21, 2 June 2022

2022-06-02T22:21:42Z

172.70.114.71: /* Table */ title text

2022-06-02T22:20:34Z

‎Table: title text

Theusaf: Reverted edits by Donald Trump (talk) to last revision by CRLF

2022-05-26T19:58:01Z

Reverted edits by Donald Trump (talk) to last revision by CRLF

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 The {{w|Hertzsprung–Russell diagram}} is a scatterplot showing absolute luminosities of stars against its effective temperature or color. It's generally used to understand a star's age.
-The axes are labeled in {{w|Kelvin}} (degrees {{w|Celsius}} above {{w|absolute zero}}) for {{w|effective temperature}} and, unlike many Hertzsprung–Russell diagrams, {{w|Watts}} for {{w|luminosity}}. While most Hertzsprung–Russell diagrams are labelled in units of {{w|solar luminosity}} or {{w|absolute magnitude}}, all three are perfectly valid measures of {{w|luminosity}}, which refers to the total power emitted by the star (or other body). {{w|Effective temperature}} refers to temperature of a blackbody with the same surface area and luminosity. This is meant to provide an estimate of the surface temperature of the object.
+The axes are labeled in {{w|Kelvin}} (degrees {{w|Celsius}} above {{w|absolute zero}}) for {{w|effective temperature}} and, unlike many Hertzsprung–Russell diagrams, {{w|Watts}} for {{w|luminosity}}. While most Hertzsprung–Russell diagrams are labelled in units of {{w|solar luminosity}} or {{w|absolute magnitude}}, all three are perfectly valid measures of {{w|luminosity}}, which refers to the total power emitted by the star (or other body). {{w|Effective temperature}} refers to temperature of a {{w|black body}} with the same surface area and luminosity. This is meant to provide an estimate of the surface temperature of the object.
 Roughly speaking, the luminosity (i.e. total power radiated) by an object is proportional to (1) the total surface area of the object, multiplied by (2) the (absolute) temperature raised to the fourth power. So a high luminosity generally results from either a very hot or a very large object, or a combination of the two. The surface-area dependence explains why the whale and the cruise ship are more luminous than the hotter campfire.

@@ Line 159: / Line 159: @@
 |4800 K
 |75 W
-|The temperature value here refers to colour temperature, which for an incandescent bulb is the same as the filament temperature. However tungsten filament lights, commonly referred to as "bulbs", have a colour temperature of between 2400 and 3600&nbsp;K, and tungsten melts at 3695&nbsp;K.
+|The temperature value here refers to color temperature, which for an incandescent bulb is the same as the filament temperature. However tungsten filament lights, commonly referred to as "bulbs", have a color temperature of between 2400 and 3600&nbsp;K, and tungsten melts at 3695&nbsp;K.
 |-
 |LED Bulb
 |5800 K
 |8 W
-|The temperature value here refers to colour temperature, not physical temperature. Color temperature is a better match to effective temperature than physical temperature. As typical semiconductors might be rated for a maximum of 150&nbsp;°C or about 420&nbsp;K, the physical temperature of an LED Bulb is considerably lower than its colour temperature.
+|The temperature value here refers to color temperature, not physical temperature. Color temperature is a better match to effective temperature than physical temperature. As typical semiconductors might be rated for a maximum of 150&nbsp;°C or about 420&nbsp;K, the physical temperature of an LED Bulb is considerably lower than its color temperature.
 |-
 |Astronomer

@@ Line 149: / Line 149: @@
 |280 K
 |78 kW
-|Must be average surface temperature as whales are warm-blooded at 37&nbsp;°C internally, interestingly this and the cruise ship may be the only entries where a significant amount of power produced is conducted away rather than radiated.  Also the power seems high compared to what I can find. [https://www.researchgate.net/publication/321972840/figure/fig1/AS:574004013604864@1513864629274/Visible-and-infrared-spectrum-images-of-various-humpback-whale-surfacing-features.png These images] suggest a surface temperature around 295K - 300K for a Humpback whale when surfacing
+|This must be average surface temperature as whales are warm-blooded at 37&nbsp;°C internally, interestingly this and the cruise ship may be the only entries where a significant amount of power produced is conducted away rather than radiated.  The power seems to be higher than reality. [https://www.researchgate.net/publication/321972840/figure/fig1/AS:574004013604864@1513864629274/Visible-and-infrared-spectrum-images-of-various-humpback-whale-surfacing-features.png These images] suggest a surface temperature around 295K - 300K for a Humpback whale when surfacing.
 |-
 |{{w|Arc lamp}}

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 |30,000 K
 |30 GW
-|The area where the bolt strikes.
+|The area where the bolt strikes, both with or without connection to [https://en.wikipedia.org/wiki/Back_to_the_Future time travel apparatus].
 |-
 |{{w|Ivanpah Solar Power Facility|Ivanpah Solar Plant}} Salt Tank

@@ Line 175: / Line 175: @@
 |{{w|Hertzsprung–Russell diagram}}
 |293 K
-|[https://www.thehomehacksdiy.com/how-much-power-watts-does-a-monitor-use/|20 W]
+|[https://www.thehomehacksdiy.com/how-much-power-watts-does-a-monitor-use/ 20 W]
 |Described in the title text, a diagram by itself doesn't have luminance or energy.  To observe it on a computer monitor, there's a certain amount of energy used however it's rare for a modern computer monitor to go above room temperature.  These numbers are indicative of a home user, rather than the setup of an evil genius or massive screens at a music festival.

@@ Line 8: / Line 8: @@
 ==Explanation==
 The {{w|Hertzsprung–Russell diagram}} is a scatterplot showing absolute luminosities of stars against its effective temperature or color. It's generally used to understand a star's age.
@@ Line 175: / Line 173: @@
 A human being generating 100&nbsp;W for 24 hours needs 2065&nbsp;kcal or 8.64&nbsp;MJ. According to the UN FAO this is e.g. the typical daily energy output of women with weight 55&nbsp;kg between 18 and 59 years having a light activity lifestyle of 1.55 times the BMR (basic metabolic rate).
 |-
-|{{w|Hertzsprung–Russell diagram}} (title text)
+|{{w|Hertzsprung–Russell diagram}}
-|(insert)
+|293 K
-|(insert)
+|[https://www.thehomehacksdiy.com/how-much-power-watts-does-a-monitor-use/|20 W]
-|Described in the title text, (insert).
+|Described in the title text, a diagram by itself doesn't have luminance or energy.  To observe it on a computer monitor, there's a certain amount of energy used however it's rare for a modern computer monitor to go above room temperature.  These numbers are indicative of a home user, rather than the setup of an evil genius or massive screens at a music festival.
 |}
 ==Transcript==
 :Expanded Hertzsprung-Russell Diagram
 :[A scatter plot is shown, with the x-axis labeled Effective Temperature (in kelvins), and the y-axis Luminosity (watts).]

← Older revision		Revision as of 22:21, 2 June 2022
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	==Explanation==		==Explanation==
		+	{{incomplete\|Created by BUMPF - The title text needs to be put in the table! Do NOT delete this tag too soon.}}

	The {{w\|Hertzsprung–Russell diagram}} is a scatterplot showing absolute luminosities of stars against its effective temperature or color. It's generally used to understand a star's age.		The {{w\|Hertzsprung–Russell diagram}} is a scatterplot showing absolute luminosities of stars against its effective temperature or color. It's generally used to understand a star's age.

← Older revision		Revision as of 22:20, 2 June 2022
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	A human being generating 100 W for 24 hours needs 2065 kcal or 8.64 MJ. According to the UN FAO this is e.g. the typical daily energy output of women with weight 55 kg between 18 and 59 years having a light activity lifestyle of 1.55 times the BMR (basic metabolic rate).		A human being generating 100 W for 24 hours needs 2065 kcal or 8.64 MJ. According to the UN FAO this is e.g. the typical daily energy output of women with weight 55 kg between 18 and 59 years having a light activity lifestyle of 1.55 times the BMR (basic metabolic rate).
		+	\|-
		+	\|{{w\|Hertzsprung–Russell diagram}} (title text)
		+	\|(insert)
		+	\|(insert)
		+	\|Described in the title text, (insert).

	\|}		\|}